Source File
	h2_bundle.go

Belonging Package
	net/http

// +build !nethttpomithttp2

// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
//   $ bundle -o=h2_bundle.go -prefix=http2 -tags=!nethttpomithttp2 golang.org/x/net/http2

// Package http2 implements the HTTP/2 protocol.
//
// This package is low-level and intended to be used directly by very
// few people. Most users will use it indirectly through the automatic
// use by the net/http package (from Go 1.6 and later).
// For use in earlier Go versions see ConfigureServer. (Transport support
// requires Go 1.6 or later)
//
// See https://http2.github.io/ for more information on HTTP/2.
//
// See https://http2.golang.org/ for a test server running this code.
//

package http

import (
	"bufio"
	"bytes"
	"compress/gzip"
	"context"
	"crypto/rand"
	"crypto/tls"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"math"
	mathrand "math/rand"
	"net"
	"net/http/httptrace"
	"net/textproto"
	"net/url"
	"os"
	"reflect"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"golang.org/x/net/http/httpguts"
	"golang.org/x/net/http2/hpack"
	"golang.org/x/net/idna"
)

// A list of the possible cipher suite ids. Taken from
// https://www.iana.org/assignments/tls-parameters/tls-parameters.txt

const (
	http2cipher_TLS_NULL_WITH_NULL_NULL               uint16 = 0x0000
	http2cipher_TLS_RSA_WITH_NULL_MD5                 uint16 = 0x0001
	http2cipher_TLS_RSA_WITH_NULL_SHA                 uint16 = 0x0002
	http2cipher_TLS_RSA_EXPORT_WITH_RC4_40_MD5        uint16 = 0x0003
	http2cipher_TLS_RSA_WITH_RC4_128_MD5              uint16 = 0x0004
	http2cipher_TLS_RSA_WITH_RC4_128_SHA              uint16 = 0x0005
	http2cipher_TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5    uint16 = 0x0006
	http2cipher_TLS_RSA_WITH_IDEA_CBC_SHA             uint16 = 0x0007
	http2cipher_TLS_RSA_EXPORT_WITH_DES40_CBC_SHA     uint16 = 0x0008
	http2cipher_TLS_RSA_WITH_DES_CBC_SHA              uint16 = 0x0009
	http2cipher_TLS_RSA_WITH_3DES_EDE_CBC_SHA         uint16 = 0x000A
	http2cipher_TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA  uint16 = 0x000B
	http2cipher_TLS_DH_DSS_WITH_DES_CBC_SHA           uint16 = 0x000C
	http2cipher_TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA      uint16 = 0x000D
	http2cipher_TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA  uint16 = 0x000E
	http2cipher_TLS_DH_RSA_WITH_DES_CBC_SHA           uint16 = 0x000F
	http2cipher_TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA      uint16 = 0x0010
	http2cipher_TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA uint16 = 0x0011
	http2cipher_TLS_DHE_DSS_WITH_DES_CBC_SHA          uint16 = 0x0012
	http2cipher_TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA     uint16 = 0x0013
	http2cipher_TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA uint16 = 0x0014
	http2cipher_TLS_DHE_RSA_WITH_DES_CBC_SHA          uint16 = 0x0015
	http2cipher_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA     uint16 = 0x0016
	http2cipher_TLS_DH_anon_EXPORT_WITH_RC4_40_MD5    uint16 = 0x0017
	http2cipher_TLS_DH_anon_WITH_RC4_128_MD5          uint16 = 0x0018
	http2cipher_TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA uint16 = 0x0019
	http2cipher_TLS_DH_anon_WITH_DES_CBC_SHA          uint16 = 0x001A
	http2cipher_TLS_DH_anon_WITH_3DES_EDE_CBC_SHA     uint16 = 0x001B
	// Reserved uint16 =  0x001C-1D
	http2cipher_TLS_KRB5_WITH_DES_CBC_SHA             uint16 = 0x001E
	http2cipher_TLS_KRB5_WITH_3DES_EDE_CBC_SHA        uint16 = 0x001F
	http2cipher_TLS_KRB5_WITH_RC4_128_SHA             uint16 = 0x0020
	http2cipher_TLS_KRB5_WITH_IDEA_CBC_SHA            uint16 = 0x0021
	http2cipher_TLS_KRB5_WITH_DES_CBC_MD5             uint16 = 0x0022
	http2cipher_TLS_KRB5_WITH_3DES_EDE_CBC_MD5        uint16 = 0x0023
	http2cipher_TLS_KRB5_WITH_RC4_128_MD5             uint16 = 0x0024
	http2cipher_TLS_KRB5_WITH_IDEA_CBC_MD5            uint16 = 0x0025
	http2cipher_TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA   uint16 = 0x0026
	http2cipher_TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA   uint16 = 0x0027
	http2cipher_TLS_KRB5_EXPORT_WITH_RC4_40_SHA       uint16 = 0x0028
	http2cipher_TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5   uint16 = 0x0029
	http2cipher_TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5   uint16 = 0x002A
	http2cipher_TLS_KRB5_EXPORT_WITH_RC4_40_MD5       uint16 = 0x002B
	http2cipher_TLS_PSK_WITH_NULL_SHA                 uint16 = 0x002C
	http2cipher_TLS_DHE_PSK_WITH_NULL_SHA             uint16 = 0x002D
	http2cipher_TLS_RSA_PSK_WITH_NULL_SHA             uint16 = 0x002E
	http2cipher_TLS_RSA_WITH_AES_128_CBC_SHA          uint16 = 0x002F
	http2cipher_TLS_DH_DSS_WITH_AES_128_CBC_SHA       uint16 = 0x0030
	http2cipher_TLS_DH_RSA_WITH_AES_128_CBC_SHA       uint16 = 0x0031
	http2cipher_TLS_DHE_DSS_WITH_AES_128_CBC_SHA      uint16 = 0x0032
	http2cipher_TLS_DHE_RSA_WITH_AES_128_CBC_SHA      uint16 = 0x0033
	http2cipher_TLS_DH_anon_WITH_AES_128_CBC_SHA      uint16 = 0x0034
	http2cipher_TLS_RSA_WITH_AES_256_CBC_SHA          uint16 = 0x0035
	http2cipher_TLS_DH_DSS_WITH_AES_256_CBC_SHA       uint16 = 0x0036
	http2cipher_TLS_DH_RSA_WITH_AES_256_CBC_SHA       uint16 = 0x0037
	http2cipher_TLS_DHE_DSS_WITH_AES_256_CBC_SHA      uint16 = 0x0038
	http2cipher_TLS_DHE_RSA_WITH_AES_256_CBC_SHA      uint16 = 0x0039
	http2cipher_TLS_DH_anon_WITH_AES_256_CBC_SHA      uint16 = 0x003A
	http2cipher_TLS_RSA_WITH_NULL_SHA256              uint16 = 0x003B
	http2cipher_TLS_RSA_WITH_AES_128_CBC_SHA256       uint16 = 0x003C
	http2cipher_TLS_RSA_WITH_AES_256_CBC_SHA256       uint16 = 0x003D
	http2cipher_TLS_DH_DSS_WITH_AES_128_CBC_SHA256    uint16 = 0x003E
	http2cipher_TLS_DH_RSA_WITH_AES_128_CBC_SHA256    uint16 = 0x003F
	http2cipher_TLS_DHE_DSS_WITH_AES_128_CBC_SHA256   uint16 = 0x0040
	http2cipher_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA     uint16 = 0x0041
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA  uint16 = 0x0042
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA  uint16 = 0x0043
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA uint16 = 0x0044
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA uint16 = 0x0045
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA uint16 = 0x0046
	// Reserved uint16 =  0x0047-4F
	// Reserved uint16 =  0x0050-58
	// Reserved uint16 =  0x0059-5C
	// Unassigned uint16 =  0x005D-5F
	// Reserved uint16 =  0x0060-66
	http2cipher_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 uint16 = 0x0067
	http2cipher_TLS_DH_DSS_WITH_AES_256_CBC_SHA256  uint16 = 0x0068
	http2cipher_TLS_DH_RSA_WITH_AES_256_CBC_SHA256  uint16 = 0x0069
	http2cipher_TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 uint16 = 0x006A
	http2cipher_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 uint16 = 0x006B
	http2cipher_TLS_DH_anon_WITH_AES_128_CBC_SHA256 uint16 = 0x006C
	http2cipher_TLS_DH_anon_WITH_AES_256_CBC_SHA256 uint16 = 0x006D
	// Unassigned uint16 =  0x006E-83
	http2cipher_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA        uint16 = 0x0084
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA     uint16 = 0x0085
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA     uint16 = 0x0086
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA    uint16 = 0x0087
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA    uint16 = 0x0088
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA    uint16 = 0x0089
	http2cipher_TLS_PSK_WITH_RC4_128_SHA                 uint16 = 0x008A
	http2cipher_TLS_PSK_WITH_3DES_EDE_CBC_SHA            uint16 = 0x008B
	http2cipher_TLS_PSK_WITH_AES_128_CBC_SHA             uint16 = 0x008C
	http2cipher_TLS_PSK_WITH_AES_256_CBC_SHA             uint16 = 0x008D
	http2cipher_TLS_DHE_PSK_WITH_RC4_128_SHA             uint16 = 0x008E
	http2cipher_TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA        uint16 = 0x008F
	http2cipher_TLS_DHE_PSK_WITH_AES_128_CBC_SHA         uint16 = 0x0090
	http2cipher_TLS_DHE_PSK_WITH_AES_256_CBC_SHA         uint16 = 0x0091
	http2cipher_TLS_RSA_PSK_WITH_RC4_128_SHA             uint16 = 0x0092
	http2cipher_TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA        uint16 = 0x0093
	http2cipher_TLS_RSA_PSK_WITH_AES_128_CBC_SHA         uint16 = 0x0094
	http2cipher_TLS_RSA_PSK_WITH_AES_256_CBC_SHA         uint16 = 0x0095
	http2cipher_TLS_RSA_WITH_SEED_CBC_SHA                uint16 = 0x0096
	http2cipher_TLS_DH_DSS_WITH_SEED_CBC_SHA             uint16 = 0x0097
	http2cipher_TLS_DH_RSA_WITH_SEED_CBC_SHA             uint16 = 0x0098
	http2cipher_TLS_DHE_DSS_WITH_SEED_CBC_SHA            uint16 = 0x0099
	http2cipher_TLS_DHE_RSA_WITH_SEED_CBC_SHA            uint16 = 0x009A
	http2cipher_TLS_DH_anon_WITH_SEED_CBC_SHA            uint16 = 0x009B
	http2cipher_TLS_RSA_WITH_AES_128_GCM_SHA256          uint16 = 0x009C
	http2cipher_TLS_RSA_WITH_AES_256_GCM_SHA384          uint16 = 0x009D
	http2cipher_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256      uint16 = 0x009E
	http2cipher_TLS_DHE_RSA_WITH_AES_256_GCM_SHA384      uint16 = 0x009F
	http2cipher_TLS_DH_RSA_WITH_AES_128_GCM_SHA256       uint16 = 0x00A0
	http2cipher_TLS_DH_RSA_WITH_AES_256_GCM_SHA384       uint16 = 0x00A1
	http2cipher_TLS_DHE_DSS_WITH_AES_128_GCM_SHA256      uint16 = 0x00A2
	http2cipher_TLS_DHE_DSS_WITH_AES_256_GCM_SHA384      uint16 = 0x00A3
	http2cipher_TLS_DH_DSS_WITH_AES_128_GCM_SHA256       uint16 = 0x00A4
	http2cipher_TLS_DH_DSS_WITH_AES_256_GCM_SHA384       uint16 = 0x00A5
	http2cipher_TLS_DH_anon_WITH_AES_128_GCM_SHA256      uint16 = 0x00A6
	http2cipher_TLS_DH_anon_WITH_AES_256_GCM_SHA384      uint16 = 0x00A7
	http2cipher_TLS_PSK_WITH_AES_128_GCM_SHA256          uint16 = 0x00A8
	http2cipher_TLS_PSK_WITH_AES_256_GCM_SHA384          uint16 = 0x00A9
	http2cipher_TLS_DHE_PSK_WITH_AES_128_GCM_SHA256      uint16 = 0x00AA
	http2cipher_TLS_DHE_PSK_WITH_AES_256_GCM_SHA384      uint16 = 0x00AB
	http2cipher_TLS_RSA_PSK_WITH_AES_128_GCM_SHA256      uint16 = 0x00AC
	http2cipher_TLS_RSA_PSK_WITH_AES_256_GCM_SHA384      uint16 = 0x00AD
	http2cipher_TLS_PSK_WITH_AES_128_CBC_SHA256          uint16 = 0x00AE
	http2cipher_TLS_PSK_WITH_AES_256_CBC_SHA384          uint16 = 0x00AF
	http2cipher_TLS_PSK_WITH_NULL_SHA256                 uint16 = 0x00B0
	http2cipher_TLS_PSK_WITH_NULL_SHA384                 uint16 = 0x00B1
	http2cipher_TLS_DHE_PSK_WITH_AES_128_CBC_SHA256      uint16 = 0x00B2
	http2cipher_TLS_DHE_PSK_WITH_AES_256_CBC_SHA384      uint16 = 0x00B3
	http2cipher_TLS_DHE_PSK_WITH_NULL_SHA256             uint16 = 0x00B4
	http2cipher_TLS_DHE_PSK_WITH_NULL_SHA384             uint16 = 0x00B5
	http2cipher_TLS_RSA_PSK_WITH_AES_128_CBC_SHA256      uint16 = 0x00B6
	http2cipher_TLS_RSA_PSK_WITH_AES_256_CBC_SHA384      uint16 = 0x00B7
	http2cipher_TLS_RSA_PSK_WITH_NULL_SHA256             uint16 = 0x00B8
	http2cipher_TLS_RSA_PSK_WITH_NULL_SHA384             uint16 = 0x00B9
	http2cipher_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256     uint16 = 0x00BA
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256  uint16 = 0x00BB
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256  uint16 = 0x00BC
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256 uint16 = 0x00BD
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 uint16 = 0x00BE
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256 uint16 = 0x00BF
	http2cipher_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256     uint16 = 0x00C0
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256  uint16 = 0x00C1
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256  uint16 = 0x00C2
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256 uint16 = 0x00C3
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 uint16 = 0x00C4
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256 uint16 = 0x00C5
	// Unassigned uint16 =  0x00C6-FE
	http2cipher_TLS_EMPTY_RENEGOTIATION_INFO_SCSV uint16 = 0x00FF
	// Unassigned uint16 =  0x01-55,*
	http2cipher_TLS_FALLBACK_SCSV uint16 = 0x5600
	// Unassigned                                   uint16 = 0x5601 - 0xC000
	http2cipher_TLS_ECDH_ECDSA_WITH_NULL_SHA                 uint16 = 0xC001
	http2cipher_TLS_ECDH_ECDSA_WITH_RC4_128_SHA              uint16 = 0xC002
	http2cipher_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA         uint16 = 0xC003
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA          uint16 = 0xC004
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA          uint16 = 0xC005
	http2cipher_TLS_ECDHE_ECDSA_WITH_NULL_SHA                uint16 = 0xC006
	http2cipher_TLS_ECDHE_ECDSA_WITH_RC4_128_SHA             uint16 = 0xC007
	http2cipher_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA        uint16 = 0xC008
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA         uint16 = 0xC009
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA         uint16 = 0xC00A
	http2cipher_TLS_ECDH_RSA_WITH_NULL_SHA                   uint16 = 0xC00B
	http2cipher_TLS_ECDH_RSA_WITH_RC4_128_SHA                uint16 = 0xC00C
	http2cipher_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA           uint16 = 0xC00D
	http2cipher_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA            uint16 = 0xC00E
	http2cipher_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA            uint16 = 0xC00F
	http2cipher_TLS_ECDHE_RSA_WITH_NULL_SHA                  uint16 = 0xC010
	http2cipher_TLS_ECDHE_RSA_WITH_RC4_128_SHA               uint16 = 0xC011
	http2cipher_TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA          uint16 = 0xC012
	http2cipher_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA           uint16 = 0xC013
	http2cipher_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA           uint16 = 0xC014
	http2cipher_TLS_ECDH_anon_WITH_NULL_SHA                  uint16 = 0xC015
	http2cipher_TLS_ECDH_anon_WITH_RC4_128_SHA               uint16 = 0xC016
	http2cipher_TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA          uint16 = 0xC017
	http2cipher_TLS_ECDH_anon_WITH_AES_128_CBC_SHA           uint16 = 0xC018
	http2cipher_TLS_ECDH_anon_WITH_AES_256_CBC_SHA           uint16 = 0xC019
	http2cipher_TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA            uint16 = 0xC01A
	http2cipher_TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA        uint16 = 0xC01B
	http2cipher_TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA        uint16 = 0xC01C
	http2cipher_TLS_SRP_SHA_WITH_AES_128_CBC_SHA             uint16 = 0xC01D
	http2cipher_TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA         uint16 = 0xC01E
	http2cipher_TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA         uint16 = 0xC01F
	http2cipher_TLS_SRP_SHA_WITH_AES_256_CBC_SHA             uint16 = 0xC020
	http2cipher_TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA         uint16 = 0xC021
	http2cipher_TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA         uint16 = 0xC022
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256      uint16 = 0xC023
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384      uint16 = 0xC024
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256       uint16 = 0xC025
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384       uint16 = 0xC026
	http2cipher_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256        uint16 = 0xC027
	http2cipher_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384        uint16 = 0xC028
	http2cipher_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256         uint16 = 0xC029
	http2cipher_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384         uint16 = 0xC02A
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256      uint16 = 0xC02B
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384      uint16 = 0xC02C
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256       uint16 = 0xC02D
	http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384       uint16 = 0xC02E
	http2cipher_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256        uint16 = 0xC02F
	http2cipher_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384        uint16 = 0xC030
	http2cipher_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256         uint16 = 0xC031
	http2cipher_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384         uint16 = 0xC032
	http2cipher_TLS_ECDHE_PSK_WITH_RC4_128_SHA               uint16 = 0xC033
	http2cipher_TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA          uint16 = 0xC034
	http2cipher_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA           uint16 = 0xC035
	http2cipher_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA           uint16 = 0xC036
	http2cipher_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256        uint16 = 0xC037
	http2cipher_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384        uint16 = 0xC038
	http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA                  uint16 = 0xC039
	http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA256               uint16 = 0xC03A
	http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA384               uint16 = 0xC03B
	http2cipher_TLS_RSA_WITH_ARIA_128_CBC_SHA256             uint16 = 0xC03C
	http2cipher_TLS_RSA_WITH_ARIA_256_CBC_SHA384             uint16 = 0xC03D
	http2cipher_TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256          uint16 = 0xC03E
	http2cipher_TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384          uint16 = 0xC03F
	http2cipher_TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256          uint16 = 0xC040
	http2cipher_TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384          uint16 = 0xC041
	http2cipher_TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256         uint16 = 0xC042
	http2cipher_TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384         uint16 = 0xC043
	http2cipher_TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256         uint16 = 0xC044
	http2cipher_TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384         uint16 = 0xC045
	http2cipher_TLS_DH_anon_WITH_ARIA_128_CBC_SHA256         uint16 = 0xC046
	http2cipher_TLS_DH_anon_WITH_ARIA_256_CBC_SHA384         uint16 = 0xC047
	http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_128_CBC_SHA256     uint16 = 0xC048
	http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_256_CBC_SHA384     uint16 = 0xC049
	http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256      uint16 = 0xC04A
	http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384      uint16 = 0xC04B
	http2cipher_TLS_ECDHE_RSA_WITH_ARIA_128_CBC_SHA256       uint16 = 0xC04C
	http2cipher_TLS_ECDHE_RSA_WITH_ARIA_256_CBC_SHA384       uint16 = 0xC04D
	http2cipher_TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256        uint16 = 0xC04E
	http2cipher_TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384        uint16 = 0xC04F
	http2cipher_TLS_RSA_WITH_ARIA_128_GCM_SHA256             uint16 = 0xC050
	http2cipher_TLS_RSA_WITH_ARIA_256_GCM_SHA384             uint16 = 0xC051
	http2cipher_TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256         uint16 = 0xC052
	http2cipher_TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384         uint16 = 0xC053
	http2cipher_TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256          uint16 = 0xC054
	http2cipher_TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384          uint16 = 0xC055
	http2cipher_TLS_DHE_DSS_WITH_ARIA_128_GCM_SHA256         uint16 = 0xC056
	http2cipher_TLS_DHE_DSS_WITH_ARIA_256_GCM_SHA384         uint16 = 0xC057
	http2cipher_TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256          uint16 = 0xC058
	http2cipher_TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384          uint16 = 0xC059
	http2cipher_TLS_DH_anon_WITH_ARIA_128_GCM_SHA256         uint16 = 0xC05A
	http2cipher_TLS_DH_anon_WITH_ARIA_256_GCM_SHA384         uint16 = 0xC05B
	http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256     uint16 = 0xC05C
	http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384     uint16 = 0xC05D
	http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256      uint16 = 0xC05E
	http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384      uint16 = 0xC05F
	http2cipher_TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256       uint16 = 0xC060
	http2cipher_TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384       uint16 = 0xC061
	http2cipher_TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256        uint16 = 0xC062
	http2cipher_TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384        uint16 = 0xC063
	http2cipher_TLS_PSK_WITH_ARIA_128_CBC_SHA256             uint16 = 0xC064
	http2cipher_TLS_PSK_WITH_ARIA_256_CBC_SHA384             uint16 = 0xC065
	http2cipher_TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256         uint16 = 0xC066
	http2cipher_TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384         uint16 = 0xC067
	http2cipher_TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256         uint16 = 0xC068
	http2cipher_TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384         uint16 = 0xC069
	http2cipher_TLS_PSK_WITH_ARIA_128_GCM_SHA256             uint16 = 0xC06A
	http2cipher_TLS_PSK_WITH_ARIA_256_GCM_SHA384             uint16 = 0xC06B
	http2cipher_TLS_DHE_PSK_WITH_ARIA_128_GCM_SHA256         uint16 = 0xC06C
	http2cipher_TLS_DHE_PSK_WITH_ARIA_256_GCM_SHA384         uint16 = 0xC06D
	http2cipher_TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256         uint16 = 0xC06E
	http2cipher_TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384         uint16 = 0xC06F
	http2cipher_TLS_ECDHE_PSK_WITH_ARIA_128_CBC_SHA256       uint16 = 0xC070
	http2cipher_TLS_ECDHE_PSK_WITH_ARIA_256_CBC_SHA384       uint16 = 0xC071
	http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256 uint16 = 0xC072
	http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384 uint16 = 0xC073
	http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256  uint16 = 0xC074
	http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384  uint16 = 0xC075
	http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256   uint16 = 0xC076
	http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384   uint16 = 0xC077
	http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256    uint16 = 0xC078
	http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384    uint16 = 0xC079
	http2cipher_TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256         uint16 = 0xC07A
	http2cipher_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384         uint16 = 0xC07B
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256     uint16 = 0xC07C
	http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384     uint16 = 0xC07D
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256      uint16 = 0xC07E
	http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384      uint16 = 0xC07F
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_128_GCM_SHA256     uint16 = 0xC080
	http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_256_GCM_SHA384     uint16 = 0xC081
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256      uint16 = 0xC082
	http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384      uint16 = 0xC083
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256     uint16 = 0xC084
	http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384     uint16 = 0xC085
	http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256 uint16 = 0xC086
	http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384 uint16 = 0xC087
	http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256  uint16 = 0xC088
	http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384  uint16 = 0xC089
	http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256   uint16 = 0xC08A
	http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384   uint16 = 0xC08B
	http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256    uint16 = 0xC08C
	http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384    uint16 = 0xC08D
	http2cipher_TLS_PSK_WITH_CAMELLIA_128_GCM_SHA256         uint16 = 0xC08E
	http2cipher_TLS_PSK_WITH_CAMELLIA_256_GCM_SHA384         uint16 = 0xC08F
	http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_128_GCM_SHA256     uint16 = 0xC090
	http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_256_GCM_SHA384     uint16 = 0xC091
	http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256     uint16 = 0xC092
	http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384     uint16 = 0xC093
	http2cipher_TLS_PSK_WITH_CAMELLIA_128_CBC_SHA256         uint16 = 0xC094
	http2cipher_TLS_PSK_WITH_CAMELLIA_256_CBC_SHA384         uint16 = 0xC095
	http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256     uint16 = 0xC096
	http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384     uint16 = 0xC097
	http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256     uint16 = 0xC098
	http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384     uint16 = 0xC099
	http2cipher_TLS_ECDHE_PSK_WITH_CAMELLIA_128_CBC_SHA256   uint16 = 0xC09A
	http2cipher_TLS_ECDHE_PSK_WITH_CAMELLIA_256_CBC_SHA384   uint16 = 0xC09B
	http2cipher_TLS_RSA_WITH_AES_128_CCM                     uint16 = 0xC09C
	http2cipher_TLS_RSA_WITH_AES_256_CCM                     uint16 = 0xC09D
	http2cipher_TLS_DHE_RSA_WITH_AES_128_CCM                 uint16 = 0xC09E
	http2cipher_TLS_DHE_RSA_WITH_AES_256_CCM                 uint16 = 0xC09F
	http2cipher_TLS_RSA_WITH_AES_128_CCM_8                   uint16 = 0xC0A0
	http2cipher_TLS_RSA_WITH_AES_256_CCM_8                   uint16 = 0xC0A1
	http2cipher_TLS_DHE_RSA_WITH_AES_128_CCM_8               uint16 = 0xC0A2
	http2cipher_TLS_DHE_RSA_WITH_AES_256_CCM_8               uint16 = 0xC0A3
	http2cipher_TLS_PSK_WITH_AES_128_CCM                     uint16 = 0xC0A4
	http2cipher_TLS_PSK_WITH_AES_256_CCM                     uint16 = 0xC0A5
	http2cipher_TLS_DHE_PSK_WITH_AES_128_CCM                 uint16 = 0xC0A6
	http2cipher_TLS_DHE_PSK_WITH_AES_256_CCM                 uint16 = 0xC0A7
	http2cipher_TLS_PSK_WITH_AES_128_CCM_8                   uint16 = 0xC0A8
	http2cipher_TLS_PSK_WITH_AES_256_CCM_8                   uint16 = 0xC0A9
	http2cipher_TLS_PSK_DHE_WITH_AES_128_CCM_8               uint16 = 0xC0AA
	http2cipher_TLS_PSK_DHE_WITH_AES_256_CCM_8               uint16 = 0xC0AB
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CCM             uint16 = 0xC0AC
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CCM             uint16 = 0xC0AD
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8           uint16 = 0xC0AE
	http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CCM_8           uint16 = 0xC0AF
	// Unassigned uint16 =  0xC0B0-FF
	// Unassigned uint16 =  0xC1-CB,*
	// Unassigned uint16 =  0xCC00-A7
	http2cipher_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   uint16 = 0xCCA8
	http2cipher_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xCCA9
	http2cipher_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256     uint16 = 0xCCAA
	http2cipher_TLS_PSK_WITH_CHACHA20_POLY1305_SHA256         uint16 = 0xCCAB
	http2cipher_TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256   uint16 = 0xCCAC
	http2cipher_TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256     uint16 = 0xCCAD
	http2cipher_TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256     uint16 = 0xCCAE
)

// isBadCipher reports whether the cipher is blacklisted by the HTTP/2 spec.
// References:
// https://tools.ietf.org/html/rfc7540#appendix-A
// Reject cipher suites from Appendix A.
// "This list includes those cipher suites that do not
// offer an ephemeral key exchange and those that are
// based on the TLS null, stream or block cipher type"
func http2isBadCipher(cipher uint16) bool {
	switch cipher {
	case http2cipher_TLS_NULL_WITH_NULL_NULL,
		http2cipher_TLS_RSA_WITH_NULL_MD5,
		http2cipher_TLS_RSA_WITH_NULL_SHA,
		http2cipher_TLS_RSA_EXPORT_WITH_RC4_40_MD5,
		http2cipher_TLS_RSA_WITH_RC4_128_MD5,
		http2cipher_TLS_RSA_WITH_RC4_128_SHA,
		http2cipher_TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5,
		http2cipher_TLS_RSA_WITH_IDEA_CBC_SHA,
		http2cipher_TLS_RSA_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_RSA_WITH_DES_CBC_SHA,
		http2cipher_TLS_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_DES_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_DES_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_DES_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_DES_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DH_anon_EXPORT_WITH_RC4_40_MD5,
		http2cipher_TLS_DH_anon_WITH_RC4_128_MD5,
		http2cipher_TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_DES_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_KRB5_WITH_DES_CBC_SHA,
		http2cipher_TLS_KRB5_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_KRB5_WITH_RC4_128_SHA,
		http2cipher_TLS_KRB5_WITH_IDEA_CBC_SHA,
		http2cipher_TLS_KRB5_WITH_DES_CBC_MD5,
		http2cipher_TLS_KRB5_WITH_3DES_EDE_CBC_MD5,
		http2cipher_TLS_KRB5_WITH_RC4_128_MD5,
		http2cipher_TLS_KRB5_WITH_IDEA_CBC_MD5,
		http2cipher_TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA,
		http2cipher_TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA,
		http2cipher_TLS_KRB5_EXPORT_WITH_RC4_40_SHA,
		http2cipher_TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5,
		http2cipher_TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5,
		http2cipher_TLS_KRB5_EXPORT_WITH_RC4_40_MD5,
		http2cipher_TLS_PSK_WITH_NULL_SHA,
		http2cipher_TLS_DHE_PSK_WITH_NULL_SHA,
		http2cipher_TLS_RSA_PSK_WITH_NULL_SHA,
		http2cipher_TLS_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_RSA_WITH_NULL_SHA256,
		http2cipher_TLS_RSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_RSA_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_DH_DSS_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_DH_RSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_DH_DSS_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_DH_RSA_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_DH_anon_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_DH_anon_WITH_AES_256_CBC_SHA256,
		http2cipher_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA,
		http2cipher_TLS_PSK_WITH_RC4_128_SHA,
		http2cipher_TLS_PSK_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_PSK_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_PSK_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_DHE_PSK_WITH_RC4_128_SHA,
		http2cipher_TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_DHE_PSK_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_DHE_PSK_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_RSA_PSK_WITH_RC4_128_SHA,
		http2cipher_TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_RSA_PSK_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_RSA_PSK_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_RSA_WITH_SEED_CBC_SHA,
		http2cipher_TLS_DH_DSS_WITH_SEED_CBC_SHA,
		http2cipher_TLS_DH_RSA_WITH_SEED_CBC_SHA,
		http2cipher_TLS_DHE_DSS_WITH_SEED_CBC_SHA,
		http2cipher_TLS_DHE_RSA_WITH_SEED_CBC_SHA,
		http2cipher_TLS_DH_anon_WITH_SEED_CBC_SHA,
		http2cipher_TLS_RSA_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_RSA_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_DH_RSA_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_DH_RSA_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_DH_DSS_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_DH_DSS_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_DH_anon_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_DH_anon_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_PSK_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_PSK_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_PSK_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_PSK_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_PSK_WITH_NULL_SHA256,
		http2cipher_TLS_PSK_WITH_NULL_SHA384,
		http2cipher_TLS_DHE_PSK_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_DHE_PSK_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_DHE_PSK_WITH_NULL_SHA256,
		http2cipher_TLS_DHE_PSK_WITH_NULL_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_NULL_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_NULL_SHA384,
		http2cipher_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256,
		http2cipher_TLS_EMPTY_RENEGOTIATION_INFO_SCSV,
		http2cipher_TLS_ECDH_ECDSA_WITH_NULL_SHA,
		http2cipher_TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_NULL_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDH_RSA_WITH_NULL_SHA,
		http2cipher_TLS_ECDH_RSA_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDHE_RSA_WITH_NULL_SHA,
		http2cipher_TLS_ECDHE_RSA_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDH_anon_WITH_NULL_SHA,
		http2cipher_TLS_ECDH_anon_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDH_anon_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDH_anon_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_SRP_SHA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_SRP_SHA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384,
		http2cipher_TLS_ECDHE_PSK_WITH_RC4_128_SHA,
		http2cipher_TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA,
		http2cipher_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA,
		http2cipher_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA,
		http2cipher_TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA,
		http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA256,
		http2cipher_TLS_ECDHE_PSK_WITH_NULL_SHA384,
		http2cipher_TLS_RSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_RSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DH_anon_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DH_anon_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_ECDSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_RSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_RSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_RSA_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_RSA_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_DH_anon_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_DH_anon_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_PSK_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_PSK_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_PSK_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_PSK_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384,
		http2cipher_TLS_ECDHE_PSK_WITH_ARIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_PSK_WITH_ARIA_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_PSK_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_PSK_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384,
		http2cipher_TLS_PSK_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_PSK_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_ECDHE_PSK_WITH_CAMELLIA_128_CBC_SHA256,
		http2cipher_TLS_ECDHE_PSK_WITH_CAMELLIA_256_CBC_SHA384,
		http2cipher_TLS_RSA_WITH_AES_128_CCM,
		http2cipher_TLS_RSA_WITH_AES_256_CCM,
		http2cipher_TLS_RSA_WITH_AES_128_CCM_8,
		http2cipher_TLS_RSA_WITH_AES_256_CCM_8,
		http2cipher_TLS_PSK_WITH_AES_128_CCM,
		http2cipher_TLS_PSK_WITH_AES_256_CCM,
		http2cipher_TLS_PSK_WITH_AES_128_CCM_8,
		http2cipher_TLS_PSK_WITH_AES_256_CCM_8:
		return true
	default:
		return false
	}
}

// ClientConnPool manages a pool of HTTP/2 client connections.
type http2ClientConnPool interface {
	GetClientConn(req *Request, addr string) (*http2ClientConn, error)
	MarkDead(*http2ClientConn)
}

// clientConnPoolIdleCloser is the interface implemented by ClientConnPool
// implementations which can close their idle connections.
type http2clientConnPoolIdleCloser interface {
	http2ClientConnPool
	closeIdleConnections()
}

var (
	_ http2clientConnPoolIdleCloser = (*http2clientConnPool)(nil)
	_ http2clientConnPoolIdleCloser = http2noDialClientConnPool{}
)

// TODO: use singleflight for dialing and addConnCalls?
type http2clientConnPool struct {
	t *http2Transport

	mu sync.Mutex // TODO: maybe switch to RWMutex
	// TODO: add support for sharing conns based on cert names
	// (e.g. share conn for googleapis.com and appspot.com)
	conns        map[string][]*http2ClientConn // key is host:port
	dialing      map[string]*http2dialCall     // currently in-flight dials
	keys         map[*http2ClientConn][]string
	addConnCalls map[string]*http2addConnCall // in-flight addConnIfNeede calls
}

func (p *http2clientConnPool) GetClientConn(req *Request, addr string) (*http2ClientConn, error) {
	return p.getClientConn(req, addr, http2dialOnMiss)
}

const (
	http2dialOnMiss   = true
	http2noDialOnMiss = false
)

// shouldTraceGetConn reports whether getClientConn should call any
// ClientTrace.GetConn hook associated with the http.Request.
//
// This complexity is needed to avoid double calls of the GetConn hook
// during the back-and-forth between net/http and x/net/http2 (when the
// net/http.Transport is upgraded to also speak http2), as well as support
// the case where x/net/http2 is being used directly.
func (p *http2clientConnPool) shouldTraceGetConn(st http2clientConnIdleState) bool {
	// If our Transport wasn't made via ConfigureTransport, always
	// trace the GetConn hook if provided, because that means the
	// http2 package is being used directly and it's the one
	// dialing, as opposed to net/http.
	if _, ok := p.t.ConnPool.(http2noDialClientConnPool); !ok {
		return true
	}
	// Otherwise, only use the GetConn hook if this connection has
	// been used previously for other requests. For fresh
	// connections, the net/http package does the dialing.
	return !st.freshConn
}

func (p *http2clientConnPool) getClientConn(req *Request, addr string, dialOnMiss bool) (*http2ClientConn, error) {
	if http2isConnectionCloseRequest(req) && dialOnMiss {
		// It gets its own connection.
		http2traceGetConn(req, addr)
		const singleUse = true
		cc, err := p.t.dialClientConn(addr, singleUse)
		if err != nil {
			return nil, err
		}
		return cc, nil
	}
	p.mu.Lock()
	for _, cc := range p.conns[addr] {
		if st := cc.idleState(); st.canTakeNewRequest {
			if p.shouldTraceGetConn(st) {
				http2traceGetConn(req, addr)
			}
			p.mu.Unlock()
			return cc, nil
		}
	}
	if !dialOnMiss {
		p.mu.Unlock()
		return nil, http2ErrNoCachedConn
	}
	http2traceGetConn(req, addr)
	call := p.getStartDialLocked(addr)
	p.mu.Unlock()
	<-call.done
	return call.res, call.err
}

// dialCall is an in-flight Transport dial call to a host.
type http2dialCall struct {
	_    http2incomparable
	p    *http2clientConnPool
	done chan struct{}    // closed when done
	res  *http2ClientConn // valid after done is closed
	err  error            // valid after done is closed
}

// requires p.mu is held.
func (p *http2clientConnPool) getStartDialLocked(addr string) *http2dialCall {
	if call, ok := p.dialing[addr]; ok {
		// A dial is already in-flight. Don't start another.
		return call
	}
	call := &http2dialCall{p: p, done: make(chan struct{})}
	if p.dialing == nil {
		p.dialing = make(map[string]*http2dialCall)
	}
	p.dialing[addr] = call
	go call.dial(addr)
	return call
}

// run in its own goroutine.
func (c *http2dialCall) dial(addr string) {
	const singleUse = false // shared conn
	c.res, c.err = c.p.t.dialClientConn(addr, singleUse)
	close(c.done)

	c.p.mu.Lock()
	delete(c.p.dialing, addr)
	if c.err == nil {
		c.p.addConnLocked(addr, c.res)
	}
	c.p.mu.Unlock()
}

// addConnIfNeeded makes a NewClientConn out of c if a connection for key doesn't
// already exist. It coalesces concurrent calls with the same key.
// This is used by the http1 Transport code when it creates a new connection. Because
// the http1 Transport doesn't de-dup TCP dials to outbound hosts (because it doesn't know
// the protocol), it can get into a situation where it has multiple TLS connections.
// This code decides which ones live or die.
// The return value used is whether c was used.
// c is never closed.
func (p *http2clientConnPool) addConnIfNeeded(key string, t *http2Transport, c *tls.Conn) (used bool, err error) {
	p.mu.Lock()
	for _, cc := range p.conns[key] {
		if cc.CanTakeNewRequest() {
			p.mu.Unlock()
			return false, nil
		}
	}
	call, dup := p.addConnCalls[key]
	if !dup {
		if p.addConnCalls == nil {
			p.addConnCalls = make(map[string]*http2addConnCall)
		}
		call = &http2addConnCall{
			p:    p,
			done: make(chan struct{}),
		}
		p.addConnCalls[key] = call
		go call.run(t, key, c)
	}
	p.mu.Unlock()

	<-call.done
	if call.err != nil {
		return false, call.err
	}
	return !dup, nil
}

type http2addConnCall struct {
	_    http2incomparable
	p    *http2clientConnPool
	done chan struct{} // closed when done
	err  error
}

func (c *http2addConnCall) run(t *http2Transport, key string, tc *tls.Conn) {
	cc, err := t.NewClientConn(tc)

	p := c.p
	p.mu.Lock()
	if err != nil {
		c.err = err
	} else {
		p.addConnLocked(key, cc)
	}
	delete(p.addConnCalls, key)
	p.mu.Unlock()
	close(c.done)
}

// p.mu must be held
func (p *http2clientConnPool) addConnLocked(key string, cc *http2ClientConn) {
	for _, v := range p.conns[key] {
		if v == cc {
			return
		}
	}
	if p.conns == nil {
		p.conns = make(map[string][]*http2ClientConn)
	}
	if p.keys == nil {
		p.keys = make(map[*http2ClientConn][]string)
	}
	p.conns[key] = append(p.conns[key], cc)
	p.keys[cc] = append(p.keys[cc], key)
}

func (p *http2clientConnPool) MarkDead(cc *http2ClientConn) {
	p.mu.Lock()
	defer p.mu.Unlock()
	for _, key := range p.keys[cc] {
		vv, ok := p.conns[key]
		if !ok {
			continue
		}
		newList := http2filterOutClientConn(vv, cc)
		if len(newList) > 0 {
			p.conns[key] = newList
		} else {
			delete(p.conns, key)
		}
	}
	delete(p.keys, cc)
}

func (p *http2clientConnPool) closeIdleConnections() {
	p.mu.Lock()
	defer p.mu.Unlock()
	// TODO: don't close a cc if it was just added to the pool
	// milliseconds ago and has never been used. There's currently
	// a small race window with the HTTP/1 Transport's integration
	// where it can add an idle conn just before using it, and
	// somebody else can concurrently call CloseIdleConns and
	// break some caller's RoundTrip.
	for _, vv := range p.conns {
		for _, cc := range vv {
			cc.closeIfIdle()
		}
	}
}

func http2filterOutClientConn(in []*http2ClientConn, exclude *http2ClientConn) []*http2ClientConn {
	out := in[:0]
	for _, v := range in {
		if v != exclude {
			out = append(out, v)
		}
	}
	// If we filtered it out, zero out the last item to prevent
	// the GC from seeing it.
	if len(in) != len(out) {
		in[len(in)-1] = nil
	}
	return out
}

// noDialClientConnPool is an implementation of http2.ClientConnPool
// which never dials. We let the HTTP/1.1 client dial and use its TLS
// connection instead.
type http2noDialClientConnPool struct{ *http2clientConnPool }

func (p http2noDialClientConnPool) GetClientConn(req *Request, addr string) (*http2ClientConn, error) {
	return p.getClientConn(req, addr, http2noDialOnMiss)
}

// Buffer chunks are allocated from a pool to reduce pressure on GC.
// The maximum wasted space per dataBuffer is 2x the largest size class,
// which happens when the dataBuffer has multiple chunks and there is
// one unread byte in both the first and last chunks. We use a few size
// classes to minimize overheads for servers that typically receive very
// small request bodies.
//
// TODO: Benchmark to determine if the pools are necessary. The GC may have
// improved enough that we can instead allocate chunks like this:
// make([]byte, max(16<<10, expectedBytesRemaining))
var (
	http2dataChunkSizeClasses = []int{
		1 << 10,
		2 << 10,
		4 << 10,
		8 << 10,
		16 << 10,
	}
	http2dataChunkPools = [...]sync.Pool{
		{New: func() interface{} { return make([]byte, 1<<10) }},
		{New: func() interface{} { return make([]byte, 2<<10) }},
		{New: func() interface{} { return make([]byte, 4<<10) }},
		{New: func() interface{} { return make([]byte, 8<<10) }},
		{New: func() interface{} { return make([]byte, 16<<10) }},
	}
)

func http2getDataBufferChunk(size int64) []byte {
	i := 0
	for ; i < len(http2dataChunkSizeClasses)-1; i++ {
		if size <= int64(http2dataChunkSizeClasses[i]) {
			break
		}
	}
	return http2dataChunkPools[i].Get().([]byte)
}

func http2putDataBufferChunk(p []byte) {
	for i, n := range http2dataChunkSizeClasses {
		if len(p) == n {
			http2dataChunkPools[i].Put(p)
			return
		}
	}
	panic(fmt.Sprintf("unexpected buffer len=%v", len(p)))
}

// dataBuffer is an io.ReadWriter backed by a list of data chunks.
// Each dataBuffer is used to read DATA frames on a single stream.
// The buffer is divided into chunks so the server can limit the
// total memory used by a single connection without limiting the
// request body size on any single stream.
type http2dataBuffer struct {
	chunks   [][]byte
	r        int   // next byte to read is chunks[0][r]
	w        int   // next byte to write is chunks[len(chunks)-1][w]
	size     int   // total buffered bytes
	expected int64 // we expect at least this many bytes in future Write calls (ignored if <= 0)
}

var http2errReadEmpty = errors.New("read from empty dataBuffer")

// Read copies bytes from the buffer into p.
// It is an error to read when no data is available.
func (b *http2dataBuffer) Read(p []byte) (int, error) {
	if b.size == 0 {
		return 0, http2errReadEmpty
	}
	var ntotal int
	for len(p) > 0 && b.size > 0 {
		readFrom := b.bytesFromFirstChunk()
		n := copy(p, readFrom)
		p = p[n:]
		ntotal += n
		b.r += n
		b.size -= n
		// If the first chunk has been consumed, advance to the next chunk.
		if b.r == len(b.chunks[0]) {
			http2putDataBufferChunk(b.chunks[0])
			end := len(b.chunks) - 1
			copy(b.chunks[:end], b.chunks[1:])
			b.chunks[end] = nil
			b.chunks = b.chunks[:end]
			b.r = 0
		}
	}
	return ntotal, nil
}

func (b *http2dataBuffer) bytesFromFirstChunk() []byte {
	if len(b.chunks) == 1 {
		return b.chunks[0][b.r:b.w]
	}
	return b.chunks[0][b.r:]
}

// Len returns the number of bytes of the unread portion of the buffer.
func (b *http2dataBuffer) Len() int {
	return b.size
}

// Write appends p to the buffer.
func (b *http2dataBuffer) Write(p []byte) (int, error) {
	ntotal := len(p)
	for len(p) > 0 {
		// If the last chunk is empty, allocate a new chunk. Try to allocate
		// enough to fully copy p plus any additional bytes we expect to
		// receive. However, this may allocate less than len(p).
		want := int64(len(p))
		if b.expected > want {
			want = b.expected
		}
		chunk := b.lastChunkOrAlloc(want)
		n := copy(chunk[b.w:], p)
		p = p[n:]
		b.w += n
		b.size += n
		b.expected -= int64(n)
	}
	return ntotal, nil
}

func (b *http2dataBuffer) lastChunkOrAlloc(want int64) []byte {
	if len(b.chunks) != 0 {
		last := b.chunks[len(b.chunks)-1]
		if b.w < len(last) {
			return last
		}
	}
	chunk := http2getDataBufferChunk(want)
	b.chunks = append(b.chunks, chunk)
	b.w = 0
	return chunk
}

// An ErrCode is an unsigned 32-bit error code as defined in the HTTP/2 spec.
type http2ErrCode uint32

const (
	http2ErrCodeNo                 http2ErrCode = 0x0
	http2ErrCodeProtocol           http2ErrCode = 0x1
	http2ErrCodeInternal           http2ErrCode = 0x2
	http2ErrCodeFlowControl        http2ErrCode = 0x3
	http2ErrCodeSettingsTimeout    http2ErrCode = 0x4
	http2ErrCodeStreamClosed       http2ErrCode = 0x5
	http2ErrCodeFrameSize          http2ErrCode = 0x6
	http2ErrCodeRefusedStream      http2ErrCode = 0x7
	http2ErrCodeCancel             http2ErrCode = 0x8
	http2ErrCodeCompression        http2ErrCode = 0x9
	http2ErrCodeConnect            http2ErrCode = 0xa
	http2ErrCodeEnhanceYourCalm    http2ErrCode = 0xb
	http2ErrCodeInadequateSecurity http2ErrCode = 0xc
	http2ErrCodeHTTP11Required     http2ErrCode = 0xd
)

var http2errCodeName = map[http2ErrCode]string{
	http2ErrCodeNo:                 "NO_ERROR",
	http2ErrCodeProtocol:           "PROTOCOL_ERROR",
	http2ErrCodeInternal:           "INTERNAL_ERROR",
	http2ErrCodeFlowControl:        "FLOW_CONTROL_ERROR",
	http2ErrCodeSettingsTimeout:    "SETTINGS_TIMEOUT",
	http2ErrCodeStreamClosed:       "STREAM_CLOSED",
	http2ErrCodeFrameSize:          "FRAME_SIZE_ERROR",
	http2ErrCodeRefusedStream:      "REFUSED_STREAM",
	http2ErrCodeCancel:             "CANCEL",
	http2ErrCodeCompression:        "COMPRESSION_ERROR",
	http2ErrCodeConnect:            "CONNECT_ERROR",
	http2ErrCodeEnhanceYourCalm:    "ENHANCE_YOUR_CALM",
	http2ErrCodeInadequateSecurity: "INADEQUATE_SECURITY",
	http2ErrCodeHTTP11Required:     "HTTP_1_1_REQUIRED",
}

func (e http2ErrCode) String() string {
	if s, ok := http2errCodeName[e]; ok {
		return s
	}
	return fmt.Sprintf("unknown error code 0x%x", uint32(e))
}

// ConnectionError is an error that results in the termination of the
// entire connection.
type http2ConnectionError http2ErrCode

func (e http2ConnectionError) Error() string {
	return fmt.Sprintf("connection error: %s", http2ErrCode(e))
}

// StreamError is an error that only affects one stream within an
// HTTP/2 connection.
type http2StreamError struct {
	StreamID uint32
	Code     http2ErrCode
	Cause    error // optional additional detail
}

func http2streamError(id uint32, code http2ErrCode) http2StreamError {
	return http2StreamError{StreamID: id, Code: code}
}

func (e http2StreamError) Error() string {
	if e.Cause != nil {
		return fmt.Sprintf("stream error: stream ID %d; %v; %v", e.StreamID, e.Code, e.Cause)
	}
	return fmt.Sprintf("stream error: stream ID %d; %v", e.StreamID, e.Code)
}

// 6.9.1 The Flow Control Window
// "If a sender receives a WINDOW_UPDATE that causes a flow control
// window to exceed this maximum it MUST terminate either the stream
// or the connection, as appropriate. For streams, [...]; for the
// connection, a GOAWAY frame with a FLOW_CONTROL_ERROR code."
type http2goAwayFlowError struct{}

func (http2goAwayFlowError) Error() string { return "connection exceeded flow control window size" }

// connError represents an HTTP/2 ConnectionError error code, along
// with a string (for debugging) explaining why.
//
// Errors of this type are only returned by the frame parser functions
// and converted into ConnectionError(Code), after stashing away
// the Reason into the Framer's errDetail field, accessible via
// the (*Framer).ErrorDetail method.
type http2connError struct {
	Code   http2ErrCode // the ConnectionError error code
	Reason string       // additional reason
}

func (e http2connError) Error() string {
	return fmt.Sprintf("http2: connection error: %v: %v", e.Code, e.Reason)
}

type http2pseudoHeaderError string

func (e http2pseudoHeaderError) Error() string {
	return fmt.Sprintf("invalid pseudo-header %q", string(e))
}

type http2duplicatePseudoHeaderError string

func (e http2duplicatePseudoHeaderError) Error() string {
	return fmt.Sprintf("duplicate pseudo-header %q", string(e))
}

type http2headerFieldNameError string

func (e http2headerFieldNameError) Error() string {
	return fmt.Sprintf("invalid header field name %q", string(e))
}

type http2headerFieldValueError string

func (e http2headerFieldValueError) Error() string {
	return fmt.Sprintf("invalid header field value %q", string(e))
}

var (
	http2errMixPseudoHeaderTypes = errors.New("mix of request and response pseudo headers")
	http2errPseudoAfterRegular   = errors.New("pseudo header field after regular")
)

// flow is the flow control window's size.
type http2flow struct {
	_ http2incomparable

	// n is the number of DATA bytes we're allowed to send.
	// A flow is kept both on a conn and a per-stream.
	n int32

	// conn points to the shared connection-level flow that is
	// shared by all streams on that conn. It is nil for the flow
	// that's on the conn directly.
	conn *http2flow
}

func (f *http2flow) setConnFlow(cf *http2flow) { f.conn = cf }

func (f *http2flow) available() int32 {
	n := f.n
	if f.conn != nil && f.conn.n < n {
		n = f.conn.n
	}
	return n
}

func (f *http2flow) take(n int32) {
	if n > f.available() {
		panic("internal error: took too much")
	}
	f.n -= n
	if f.conn != nil {
		f.conn.n -= n
	}
}

// add adds n bytes (positive or negative) to the flow control window.
// It returns false if the sum would exceed 2^31-1.
func (f *http2flow) add(n int32) bool {
	sum := f.n + n
	if (sum > n) == (f.n > 0) {
		f.n = sum
		return true
	}
	return false
}

const http2frameHeaderLen = 9

var http2padZeros = make([]byte, 255) // zeros for padding

// A FrameType is a registered frame type as defined in
// http://http2.github.io/http2-spec/#rfc.section.11.2
type http2FrameType uint8

const (
	http2FrameData         http2FrameType = 0x0
	http2FrameHeaders      http2FrameType = 0x1
	http2FramePriority     http2FrameType = 0x2
	http2FrameRSTStream    http2FrameType = 0x3
	http2FrameSettings     http2FrameType = 0x4
	http2FramePushPromise  http2FrameType = 0x5
	http2FramePing         http2FrameType = 0x6
	http2FrameGoAway       http2FrameType = 0x7
	http2FrameWindowUpdate http2FrameType = 0x8
	http2FrameContinuation http2FrameType = 0x9
)

var http2frameName = map[http2FrameType]string{
	http2FrameData:         "DATA",
	http2FrameHeaders:      "HEADERS",
	http2FramePriority:     "PRIORITY",
	http2FrameRSTStream:    "RST_STREAM",
	http2FrameSettings:     "SETTINGS",
	http2FramePushPromise:  "PUSH_PROMISE",
	http2FramePing:         "PING",
	http2FrameGoAway:       "GOAWAY",
	http2FrameWindowUpdate: "WINDOW_UPDATE",
	http2FrameContinuation: "CONTINUATION",
}

func (t http2FrameType) String() string {
	if s, ok := http2frameName[t]; ok {
		return s
	}
	return fmt.Sprintf("UNKNOWN_FRAME_TYPE_%d", uint8(t))
}

// Flags is a bitmask of HTTP/2 flags.
// The meaning of flags varies depending on the frame type.
type http2Flags uint8

// Has reports whether f contains all (0 or more) flags in v.
func (f http2Flags) Has(v http2Flags) bool {
	return (f & v) == v
}

// Frame-specific FrameHeader flag bits.
const (
	// Data Frame
	http2FlagDataEndStream http2Flags = 0x1
	http2FlagDataPadded    http2Flags = 0x8

	// Headers Frame
	http2FlagHeadersEndStream  http2Flags = 0x1
	http2FlagHeadersEndHeaders http2Flags = 0x4
	http2FlagHeadersPadded     http2Flags = 0x8
	http2FlagHeadersPriority   http2Flags = 0x20

	// Settings Frame
	http2FlagSettingsAck http2Flags = 0x1

	// Ping Frame
	http2FlagPingAck http2Flags = 0x1

	// Continuation Frame
	http2FlagContinuationEndHeaders http2Flags = 0x4

	http2FlagPushPromiseEndHeaders http2Flags = 0x4
	http2FlagPushPromisePadded     http2Flags = 0x8
)

var http2flagName = map[http2FrameType]map[http2Flags]string{
	http2FrameData: {
		http2FlagDataEndStream: "END_STREAM",
		http2FlagDataPadded:    "PADDED",
	},
	http2FrameHeaders: {
		http2FlagHeadersEndStream:  "END_STREAM",
		http2FlagHeadersEndHeaders: "END_HEADERS",
		http2FlagHeadersPadded:     "PADDED",
		http2FlagHeadersPriority:   "PRIORITY",
	},
	http2FrameSettings: {
		http2FlagSettingsAck: "ACK",
	},
	http2FramePing: {
		http2FlagPingAck: "ACK",
	},
	http2FrameContinuation: {
		http2FlagContinuationEndHeaders: "END_HEADERS",
	},
	http2FramePushPromise: {
		http2FlagPushPromiseEndHeaders: "END_HEADERS",
		http2FlagPushPromisePadded:     "PADDED",
	},
}

// a frameParser parses a frame given its FrameHeader and payload
// bytes. The length of payload will always equal fh.Length (which
// might be 0).
type http2frameParser func(fc *http2frameCache, fh http2FrameHeader, payload []byte) (http2Frame, error)

var http2frameParsers = map[http2FrameType]http2frameParser{
	http2FrameData:         http2parseDataFrame,
	http2FrameHeaders:      http2parseHeadersFrame,
	http2FramePriority:     http2parsePriorityFrame,
	http2FrameRSTStream:    http2parseRSTStreamFrame,
	http2FrameSettings:     http2parseSettingsFrame,
	http2FramePushPromise:  http2parsePushPromise,
	http2FramePing:         http2parsePingFrame,
	http2FrameGoAway:       http2parseGoAwayFrame,
	http2FrameWindowUpdate: http2parseWindowUpdateFrame,
	http2FrameContinuation: http2parseContinuationFrame,
}

func http2typeFrameParser(t http2FrameType) http2frameParser {
	if f := http2frameParsers[t]; f != nil {
		return f
	}
	return http2parseUnknownFrame
}

// A FrameHeader is the 9 byte header of all HTTP/2 frames.
//
// See http://http2.github.io/http2-spec/#FrameHeader
type http2FrameHeader struct {
	valid bool // caller can access []byte fields in the Frame

	// Type is the 1 byte frame type. There are ten standard frame
	// types, but extension frame types may be written by WriteRawFrame
	// and will be returned by ReadFrame (as UnknownFrame).
	Type http2FrameType

	// Flags are the 1 byte of 8 potential bit flags per frame.
	// They are specific to the frame type.
	Flags http2Flags

	// Length is the length of the frame, not including the 9 byte header.
	// The maximum size is one byte less than 16MB (uint24), but only
	// frames up to 16KB are allowed without peer agreement.
	Length uint32

	// StreamID is which stream this frame is for. Certain frames
	// are not stream-specific, in which case this field is 0.
	StreamID uint32
}

// Header returns h. It exists so FrameHeaders can be embedded in other
// specific frame types and implement the Frame interface.
func (h http2FrameHeader) Header() http2FrameHeader { return h }

func (h http2FrameHeader) String() string {
	var buf bytes.Buffer
	buf.WriteString("[FrameHeader ")
	h.writeDebug(&buf)
	buf.WriteByte(']')
	return buf.String()
}

func (h http2FrameHeader) writeDebug(buf *bytes.Buffer) {
	buf.WriteString(h.Type.String())
	if h.Flags != 0 {
		buf.WriteString(" flags=")
		set := 0
		for i := uint8(0); i < 8; i++ {
			if h.Flags&(1<<i) == 0 {
				continue
			}
			set++
			if set > 1 {
				buf.WriteByte('|')
			}
			name := http2flagName[h.Type][http2Flags(1<<i)]
			if name != "" {
				buf.WriteString(name)
			} else {
				fmt.Fprintf(buf, "0x%x", 1<<i)
			}
		}
	}
	if h.StreamID != 0 {
		fmt.Fprintf(buf, " stream=%d", h.StreamID)
	}
	fmt.Fprintf(buf, " len=%d", h.Length)
}

func (h *http2FrameHeader) checkValid() {
	if !h.valid {
		panic("Frame accessor called on non-owned Frame")
	}
}

func (h *http2FrameHeader) invalidate() { h.valid = false }

// frame header bytes.
// Used only by ReadFrameHeader.
var http2fhBytes = sync.Pool{
	New: func() interface{} {
		buf := make([]byte, http2frameHeaderLen)
		return &buf
	},
}

// ReadFrameHeader reads 9 bytes from r and returns a FrameHeader.
// Most users should use Framer.ReadFrame instead.
func http2ReadFrameHeader(r io.Reader) (http2FrameHeader, error) {
	bufp := http2fhBytes.Get().(*[]byte)
	defer http2fhBytes.Put(bufp)
	return http2readFrameHeader(*bufp, r)
}

func http2readFrameHeader(buf []byte, r io.Reader) (http2FrameHeader, error) {
	_, err := io.ReadFull(r, buf[:http2frameHeaderLen])
	if err != nil {
		return http2FrameHeader{}, err
	}
	return http2FrameHeader{
		Length:   (uint32(buf[0])<<16 | uint32(buf[1])<<8 | uint32(buf[2])),
		Type:     http2FrameType(buf[3]),
		Flags:    http2Flags(buf[4]),
		StreamID: binary.BigEndian.Uint32(buf[5:]) & (1<<31 - 1),
		valid:    true,
	}, nil
}

// A Frame is the base interface implemented by all frame types.
// Callers will generally type-assert the specific frame type:
// *HeadersFrame, *SettingsFrame, *WindowUpdateFrame, etc.
//
// Frames are only valid until the next call to Framer.ReadFrame.
type http2Frame interface {
	Header() http2FrameHeader

	// invalidate is called by Framer.ReadFrame to make this
	// frame's buffers as being invalid, since the subsequent
	// frame will reuse them.
	invalidate()
}

// A Framer reads and writes Frames.
type http2Framer struct {
	r         io.Reader
	lastFrame http2Frame
	errDetail error

	// lastHeaderStream is non-zero if the last frame was an
	// unfinished HEADERS/CONTINUATION.
	lastHeaderStream uint32

	maxReadSize uint32
	headerBuf   [http2frameHeaderLen]byte

	// TODO: let getReadBuf be configurable, and use a less memory-pinning
	// allocator in server.go to minimize memory pinned for many idle conns.
	// Will probably also need to make frame invalidation have a hook too.
	getReadBuf func(size uint32) []byte
	readBuf    []byte // cache for default getReadBuf

	maxWriteSize uint32 // zero means unlimited; TODO: implement

	w    io.Writer
	wbuf []byte

	// AllowIllegalWrites permits the Framer's Write methods to
	// write frames that do not conform to the HTTP/2 spec. This
	// permits using the Framer to test other HTTP/2
	// implementations' conformance to the spec.
	// If false, the Write methods will prefer to return an error
	// rather than comply.
	AllowIllegalWrites bool

	// AllowIllegalReads permits the Framer's ReadFrame method
	// to return non-compliant frames or frame orders.
	// This is for testing and permits using the Framer to test
	// other HTTP/2 implementations' conformance to the spec.
	// It is not compatible with ReadMetaHeaders.
	AllowIllegalReads bool

	// ReadMetaHeaders if non-nil causes ReadFrame to merge
	// HEADERS and CONTINUATION frames together and return
	// MetaHeadersFrame instead.
	ReadMetaHeaders *hpack.Decoder

	// MaxHeaderListSize is the http2 MAX_HEADER_LIST_SIZE.
	// It's used only if ReadMetaHeaders is set; 0 means a sane default
	// (currently 16MB)
	// If the limit is hit, MetaHeadersFrame.Truncated is set true.
	MaxHeaderListSize uint32

	// TODO: track which type of frame & with which flags was sent
	// last. Then return an error (unless AllowIllegalWrites) if
	// we're in the middle of a header block and a
	// non-Continuation or Continuation on a different stream is
	// attempted to be written.

	logReads, logWrites bool

	debugFramer       *http2Framer // only use for logging written writes
	debugFramerBuf    *bytes.Buffer
	debugReadLoggerf  func(string, ...interface{})
	debugWriteLoggerf func(string, ...interface{})

	frameCache *http2frameCache // nil if frames aren't reused (default)
}

func (fr *http2Framer) maxHeaderListSize() uint32 {
	if fr.MaxHeaderListSize == 0 {
		return 16 << 20 // sane default, per docs
	}
	return fr.MaxHeaderListSize
}

func (f *http2Framer) startWrite(ftype http2FrameType, flags http2Flags, streamID uint32) {
	// Write the FrameHeader.
	f.wbuf = append(f.wbuf[:0],
		0, // 3 bytes of length, filled in in endWrite
		0,
		0,
		byte(ftype),
		byte(flags),
		byte(streamID>>24),
		byte(streamID>>16),
		byte(streamID>>8),
		byte(streamID))
}

func (f *http2Framer) endWrite() error {
	// Now that we know the final size, fill in the FrameHeader in
	// the space previously reserved for it. Abuse append.
	length := len(f.wbuf) - http2frameHeaderLen
	if length >= (1 << 24) {
		return http2ErrFrameTooLarge
	}
	_ = append(f.wbuf[:0],
		byte(length>>16),
		byte(length>>8),
		byte(length))
	if f.logWrites {
		f.logWrite()
	}

	n, err := f.w.Write(f.wbuf)
	if err == nil && n != len(f.wbuf) {
		err = io.ErrShortWrite
	}
	return err
}

func (f *http2Framer) logWrite() {
	if f.debugFramer == nil {
		f.debugFramerBuf = new(bytes.Buffer)
		f.debugFramer = http2NewFramer(nil, f.debugFramerBuf)
		f.debugFramer.logReads = false // we log it ourselves, saying "wrote" below
		// Let us read anything, even if we accidentally wrote it
		// in the wrong order:
		f.debugFramer.AllowIllegalReads = true
	}
	f.debugFramerBuf.Write(f.wbuf)
	fr, err := f.debugFramer.ReadFrame()
	if err != nil {
		f.debugWriteLoggerf("http2: Framer %p: failed to decode just-written frame", f)
		return
	}
	f.debugWriteLoggerf("http2: Framer %p: wrote %v", f, http2summarizeFrame(fr))
}

func (f *http2Framer) writeByte(v byte) { f.wbuf = append(f.wbuf, v) }

func (f *http2Framer) writeBytes(v []byte) { f.wbuf = append(f.wbuf, v...) }

func (f *http2Framer) writeUint16(v uint16) { f.wbuf = append(f.wbuf, byte(v>>8), byte(v)) }

func (f *http2Framer) writeUint32(v uint32) {
	f.wbuf = append(f.wbuf, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
}

const (
	http2minMaxFrameSize = 1 << 14
	http2maxFrameSize    = 1<<24 - 1
)

// SetReuseFrames allows the Framer to reuse Frames.
// If called on a Framer, Frames returned by calls to ReadFrame are only
// valid until the next call to ReadFrame.
func (fr *http2Framer) SetReuseFrames() {
	if fr.frameCache != nil {
		return
	}
	fr.frameCache = &http2frameCache{}
}

type http2frameCache struct {
	dataFrame http2DataFrame
}

func (fc *http2frameCache) getDataFrame() *http2DataFrame {
	if fc == nil {
		return &http2DataFrame{}
	}
	return &fc.dataFrame
}

// NewFramer returns a Framer that writes frames to w and reads them from r.
func http2NewFramer(w io.Writer, r io.Reader) *http2Framer {
	fr := &http2Framer{
		w:                 w,
		r:                 r,
		logReads:          http2logFrameReads,
		logWrites:         http2logFrameWrites,
		debugReadLoggerf:  log.Printf,
		debugWriteLoggerf: log.Printf,
	}
	fr.getReadBuf = func(size uint32) []byte {
		if cap(fr.readBuf) >= int(size) {
			return fr.readBuf[:size]
		}
		fr.readBuf = make([]byte, size)
		return fr.readBuf
	}
	fr.SetMaxReadFrameSize(http2maxFrameSize)
	return fr
}

// SetMaxReadFrameSize sets the maximum size of a frame
// that will be read by a subsequent call to ReadFrame.
// It is the caller's responsibility to advertise this
// limit with a SETTINGS frame.
func (fr *http2Framer) SetMaxReadFrameSize(v uint32) {
	if v > http2maxFrameSize {
		v = http2maxFrameSize
	}
	fr.maxReadSize = v
}

// ErrorDetail returns a more detailed error of the last error
// returned by Framer.ReadFrame. For instance, if ReadFrame
// returns a StreamError with code PROTOCOL_ERROR, ErrorDetail
// will say exactly what was invalid. ErrorDetail is not guaranteed
// to return a non-nil value and like the rest of the http2 package,
// its return value is not protected by an API compatibility promise.
// ErrorDetail is reset after the next call to ReadFrame.
func (fr *http2Framer) ErrorDetail() error {
	return fr.errDetail
}

// ErrFrameTooLarge is returned from Framer.ReadFrame when the peer
// sends a frame that is larger than declared with SetMaxReadFrameSize.
var http2ErrFrameTooLarge = errors.New("http2: frame too large")

// terminalReadFrameError reports whether err is an unrecoverable
// error from ReadFrame and no other frames should be read.
func http2terminalReadFrameError(err error) bool {
	if _, ok := err.(http2StreamError); ok {
		return false
	}
	return err != nil
}

// ReadFrame reads a single frame. The returned Frame is only valid
// until the next call to ReadFrame.
//
// If the frame is larger than previously set with SetMaxReadFrameSize, the
// returned error is ErrFrameTooLarge. Other errors may be of type
// ConnectionError, StreamError, or anything else from the underlying
// reader.
func (fr *http2Framer) ReadFrame() (http2Frame, error) {
	fr.errDetail = nil
	if fr.lastFrame != nil {
		fr.lastFrame.invalidate()
	}
	fh, err := http2readFrameHeader(fr.headerBuf[:], fr.r)
	if err != nil {
		return nil, err
	}
	if fh.Length > fr.maxReadSize {
		return nil, http2ErrFrameTooLarge
	}
	payload := fr.getReadBuf(fh.Length)
	if _, err := io.ReadFull(fr.r, payload); err != nil {
		return nil, err
	}
	f, err := http2typeFrameParser(fh.Type)(fr.frameCache, fh, payload)
	if err != nil {
		if ce, ok := err.(http2connError); ok {
			return nil, fr.connError(ce.Code, ce.Reason)
		}
		return nil, err
	}
	if err := fr.checkFrameOrder(f); err != nil {
		return nil, err
	}
	if fr.logReads {
		fr.debugReadLoggerf("http2: Framer %p: read %v", fr, http2summarizeFrame(f))
	}
	if fh.Type == http2FrameHeaders && fr.ReadMetaHeaders != nil {
		return fr.readMetaFrame(f.(*http2HeadersFrame))
	}
	return f, nil
}

// connError returns ConnectionError(code) but first
// stashes away a public reason to the caller can optionally relay it
// to the peer before hanging up on them. This might help others debug
// their implementations.
func (fr *http2Framer) connError(code http2ErrCode, reason string) error {
	fr.errDetail = errors.New(reason)
	return http2ConnectionError(code)
}

// checkFrameOrder reports an error if f is an invalid frame to return
// next from ReadFrame. Mostly it checks whether HEADERS and
// CONTINUATION frames are contiguous.
func (fr *http2Framer) checkFrameOrder(f http2Frame) error {
	last := fr.lastFrame
	fr.lastFrame = f
	if fr.AllowIllegalReads {
		return nil
	}

	fh := f.Header()
	if fr.lastHeaderStream != 0 {
		if fh.Type != http2FrameContinuation {
			return fr.connError(http2ErrCodeProtocol,
				fmt.Sprintf("got %s for stream %d; expected CONTINUATION following %s for stream %d",
					fh.Type, fh.StreamID,
					last.Header().Type, fr.lastHeaderStream))
		}
		if fh.StreamID != fr.lastHeaderStream {
			return fr.connError(http2ErrCodeProtocol,
				fmt.Sprintf("got CONTINUATION for stream %d; expected stream %d",
					fh.StreamID, fr.lastHeaderStream))
		}
	} else if fh.Type == http2FrameContinuation {
		return fr.connError(http2ErrCodeProtocol, fmt.Sprintf("unexpected CONTINUATION for stream %d", fh.StreamID))
	}

	switch fh.Type {
	case http2FrameHeaders, http2FrameContinuation:
		if fh.Flags.Has(http2FlagHeadersEndHeaders) {
			fr.lastHeaderStream = 0
		} else {
			fr.lastHeaderStream = fh.StreamID
		}
	}

	return nil
}

// A DataFrame conveys arbitrary, variable-length sequences of octets
// associated with a stream.
// See http://http2.github.io/http2-spec/#rfc.section.6.1
type http2DataFrame struct {
	http2FrameHeader
	data []byte
}

func (f *http2DataFrame) StreamEnded() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagDataEndStream)
}

// Data returns the frame's data octets, not including any padding
// size byte or padding suffix bytes.
// The caller must not retain the returned memory past the next
// call to ReadFrame.
func (f *http2DataFrame) Data() []byte {
	f.checkValid()
	return f.data
}

func http2parseDataFrame(fc *http2frameCache, fh http2FrameHeader, payload []byte) (http2Frame, error) {
	if fh.StreamID == 0 {
		// DATA frames MUST be associated with a stream. If a
		// DATA frame is received whose stream identifier
		// field is 0x0, the recipient MUST respond with a
		// connection error (Section 5.4.1) of type
		// PROTOCOL_ERROR.
		return nil, http2connError{http2ErrCodeProtocol, "DATA frame with stream ID 0"}
	}
	f := fc.getDataFrame()
	f.http2FrameHeader = fh

	var padSize byte
	if fh.Flags.Has(http2FlagDataPadded) {
		var err error
		payload, padSize, err = http2readByte(payload)
		if err != nil {
			return nil, err
		}
	}
	if int(padSize) > len(payload) {
		// If the length of the padding is greater than the
		// length of the frame payload, the recipient MUST
		// treat this as a connection error.
		// Filed: https://github.com/http2/http2-spec/issues/610
		return nil, http2connError{http2ErrCodeProtocol, "pad size larger than data payload"}
	}
	f.data = payload[:len(payload)-int(padSize)]
	return f, nil
}

var (
	http2errStreamID    = errors.New("invalid stream ID")
	http2errDepStreamID = errors.New("invalid dependent stream ID")
	http2errPadLength   = errors.New("pad length too large")
	http2errPadBytes    = errors.New("padding bytes must all be zeros unless AllowIllegalWrites is enabled")
)

func http2validStreamIDOrZero(streamID uint32) bool {
	return streamID&(1<<31) == 0
}

func http2validStreamID(streamID uint32) bool {
	return streamID != 0 && streamID&(1<<31) == 0
}

// WriteData writes a DATA frame.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility not to violate the maximum frame size
// and to not call other Write methods concurrently.
func (f *http2Framer) WriteData(streamID uint32, endStream bool, data []byte) error {
	return f.WriteDataPadded(streamID, endStream, data, nil)
}

// WriteDataPadded writes a DATA frame with optional padding.
//
// If pad is nil, the padding bit is not sent.
// The length of pad must not exceed 255 bytes.
// The bytes of pad must all be zero, unless f.AllowIllegalWrites is set.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility not to violate the maximum frame size
// and to not call other Write methods concurrently.
func (f *http2Framer) WriteDataPadded(streamID uint32, endStream bool, data, pad []byte) error {
	if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	if len(pad) > 0 {
		if len(pad) > 255 {
			return http2errPadLength
		}
		if !f.AllowIllegalWrites {
			for _, b := range pad {
				if b != 0 {
					// "Padding octets MUST be set to zero when sending."
					return http2errPadBytes
				}
			}
		}
	}
	var flags http2Flags
	if endStream {
		flags |= http2FlagDataEndStream
	}
	if pad != nil {
		flags |= http2FlagDataPadded
	}
	f.startWrite(http2FrameData, flags, streamID)
	if pad != nil {
		f.wbuf = append(f.wbuf, byte(len(pad)))
	}
	f.wbuf = append(f.wbuf, data...)
	f.wbuf = append(f.wbuf, pad...)
	return f.endWrite()
}

// A SettingsFrame conveys configuration parameters that affect how
// endpoints communicate, such as preferences and constraints on peer
// behavior.
//
// See http://http2.github.io/http2-spec/#SETTINGS
type http2SettingsFrame struct {
	http2FrameHeader
	p []byte
}

func http2parseSettingsFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	if fh.Flags.Has(http2FlagSettingsAck) && fh.Length > 0 {
		// When this (ACK 0x1) bit is set, the payload of the
		// SETTINGS frame MUST be empty. Receipt of a
		// SETTINGS frame with the ACK flag set and a length
		// field value other than 0 MUST be treated as a
		// connection error (Section 5.4.1) of type
		// FRAME_SIZE_ERROR.
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	if fh.StreamID != 0 {
		// SETTINGS frames always apply to a connection,
		// never a single stream. The stream identifier for a
		// SETTINGS frame MUST be zero (0x0).  If an endpoint
		// receives a SETTINGS frame whose stream identifier
		// field is anything other than 0x0, the endpoint MUST
		// respond with a connection error (Section 5.4.1) of
		// type PROTOCOL_ERROR.
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	if len(p)%6 != 0 {
		// Expecting even number of 6 byte settings.
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	f := &http2SettingsFrame{http2FrameHeader: fh, p: p}
	if v, ok := f.Value(http2SettingInitialWindowSize); ok && v > (1<<31)-1 {
		// Values above the maximum flow control window size of 2^31 - 1 MUST
		// be treated as a connection error (Section 5.4.1) of type
		// FLOW_CONTROL_ERROR.
		return nil, http2ConnectionError(http2ErrCodeFlowControl)
	}
	return f, nil
}

func (f *http2SettingsFrame) IsAck() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagSettingsAck)
}

func (f *http2SettingsFrame) Value(id http2SettingID) (v uint32, ok bool) {
	f.checkValid()
	for i := 0; i < f.NumSettings(); i++ {
		if s := f.Setting(i); s.ID == id {
			return s.Val, true
		}
	}
	return 0, false
}

// Setting returns the setting from the frame at the given 0-based index.
// The index must be >= 0 and less than f.NumSettings().
func (f *http2SettingsFrame) Setting(i int) http2Setting {
	buf := f.p
	return http2Setting{
		ID:  http2SettingID(binary.BigEndian.Uint16(buf[i*6 : i*6+2])),
		Val: binary.BigEndian.Uint32(buf[i*6+2 : i*6+6]),
	}
}

func (f *http2SettingsFrame) NumSettings() int { return len(f.p) / 6 }

// HasDuplicates reports whether f contains any duplicate setting IDs.
func (f *http2SettingsFrame) HasDuplicates() bool {
	num := f.NumSettings()
	if num == 0 {
		return false
	}
	// If it's small enough (the common case), just do the n^2
	// thing and avoid a map allocation.
	if num < 10 {
		for i := 0; i < num; i++ {
			idi := f.Setting(i).ID
			for j := i + 1; j < num; j++ {
				idj := f.Setting(j).ID
				if idi == idj {
					return true
				}
			}
		}
		return false
	}
	seen := map[http2SettingID]bool{}
	for i := 0; i < num; i++ {
		id := f.Setting(i).ID
		if seen[id] {
			return true
		}
		seen[id] = true
	}
	return false
}

// ForeachSetting runs fn for each setting.
// It stops and returns the first error.
func (f *http2SettingsFrame) ForeachSetting(fn func(http2Setting) error) error {
	f.checkValid()
	for i := 0; i < f.NumSettings(); i++ {
		if err := fn(f.Setting(i)); err != nil {
			return err
		}
	}
	return nil
}

// WriteSettings writes a SETTINGS frame with zero or more settings
// specified and the ACK bit not set.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WriteSettings(settings ...http2Setting) error {
	f.startWrite(http2FrameSettings, 0, 0)
	for _, s := range settings {
		f.writeUint16(uint16(s.ID))
		f.writeUint32(s.Val)
	}
	return f.endWrite()
}

// WriteSettingsAck writes an empty SETTINGS frame with the ACK bit set.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WriteSettingsAck() error {
	f.startWrite(http2FrameSettings, http2FlagSettingsAck, 0)
	return f.endWrite()
}

// A PingFrame is a mechanism for measuring a minimal round trip time
// from the sender, as well as determining whether an idle connection
// is still functional.
// See http://http2.github.io/http2-spec/#rfc.section.6.7
type http2PingFrame struct {
	http2FrameHeader
	Data [8]byte
}

func (f *http2PingFrame) IsAck() bool { return f.Flags.Has(http2FlagPingAck) }

func http2parsePingFrame(_ *http2frameCache, fh http2FrameHeader, payload []byte) (http2Frame, error) {
	if len(payload) != 8 {
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	if fh.StreamID != 0 {
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	f := &http2PingFrame{http2FrameHeader: fh}
	copy(f.Data[:], payload)
	return f, nil
}

func (f *http2Framer) WritePing(ack bool, data [8]byte) error {
	var flags http2Flags
	if ack {
		flags = http2FlagPingAck
	}
	f.startWrite(http2FramePing, flags, 0)
	f.writeBytes(data[:])
	return f.endWrite()
}

// A GoAwayFrame informs the remote peer to stop creating streams on this connection.
// See http://http2.github.io/http2-spec/#rfc.section.6.8
type http2GoAwayFrame struct {
	http2FrameHeader
	LastStreamID uint32
	ErrCode      http2ErrCode
	debugData    []byte
}

// DebugData returns any debug data in the GOAWAY frame. Its contents
// are not defined.
// The caller must not retain the returned memory past the next
// call to ReadFrame.
func (f *http2GoAwayFrame) DebugData() []byte {
	f.checkValid()
	return f.debugData
}

func http2parseGoAwayFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	if fh.StreamID != 0 {
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	if len(p) < 8 {
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	return &http2GoAwayFrame{
		http2FrameHeader: fh,
		LastStreamID:     binary.BigEndian.Uint32(p[:4]) & (1<<31 - 1),
		ErrCode:          http2ErrCode(binary.BigEndian.Uint32(p[4:8])),
		debugData:        p[8:],
	}, nil
}

func (f *http2Framer) WriteGoAway(maxStreamID uint32, code http2ErrCode, debugData []byte) error {
	f.startWrite(http2FrameGoAway, 0, 0)
	f.writeUint32(maxStreamID & (1<<31 - 1))
	f.writeUint32(uint32(code))
	f.writeBytes(debugData)
	return f.endWrite()
}

// An UnknownFrame is the frame type returned when the frame type is unknown
// or no specific frame type parser exists.
type http2UnknownFrame struct {
	http2FrameHeader
	p []byte
}

// Payload returns the frame's payload (after the header).  It is not
// valid to call this method after a subsequent call to
// Framer.ReadFrame, nor is it valid to retain the returned slice.
// The memory is owned by the Framer and is invalidated when the next
// frame is read.
func (f *http2UnknownFrame) Payload() []byte {
	f.checkValid()
	return f.p
}

func http2parseUnknownFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	return &http2UnknownFrame{fh, p}, nil
}

// A WindowUpdateFrame is used to implement flow control.
// See http://http2.github.io/http2-spec/#rfc.section.6.9
type http2WindowUpdateFrame struct {
	http2FrameHeader
	Increment uint32 // never read with high bit set
}

func http2parseWindowUpdateFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	if len(p) != 4 {
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	inc := binary.BigEndian.Uint32(p[:4]) & 0x7fffffff // mask off high reserved bit
	if inc == 0 {
		// A receiver MUST treat the receipt of a
		// WINDOW_UPDATE frame with an flow control window
		// increment of 0 as a stream error (Section 5.4.2) of
		// type PROTOCOL_ERROR; errors on the connection flow
		// control window MUST be treated as a connection
		// error (Section 5.4.1).
		if fh.StreamID == 0 {
			return nil, http2ConnectionError(http2ErrCodeProtocol)
		}
		return nil, http2streamError(fh.StreamID, http2ErrCodeProtocol)
	}
	return &http2WindowUpdateFrame{
		http2FrameHeader: fh,
		Increment:        inc,
	}, nil
}

// WriteWindowUpdate writes a WINDOW_UPDATE frame.
// The increment value must be between 1 and 2,147,483,647, inclusive.
// If the Stream ID is zero, the window update applies to the
// connection as a whole.
func (f *http2Framer) WriteWindowUpdate(streamID, incr uint32) error {
	// "The legal range for the increment to the flow control window is 1 to 2^31-1 (2,147,483,647) octets."
	if (incr < 1 || incr > 2147483647) && !f.AllowIllegalWrites {
		return errors.New("illegal window increment value")
	}
	f.startWrite(http2FrameWindowUpdate, 0, streamID)
	f.writeUint32(incr)
	return f.endWrite()
}

// A HeadersFrame is used to open a stream and additionally carries a
// header block fragment.
type http2HeadersFrame struct {
	http2FrameHeader

	// Priority is set if FlagHeadersPriority is set in the FrameHeader.
	Priority http2PriorityParam

	headerFragBuf []byte // not owned
}

func (f *http2HeadersFrame) HeaderBlockFragment() []byte {
	f.checkValid()
	return f.headerFragBuf
}

func (f *http2HeadersFrame) HeadersEnded() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagHeadersEndHeaders)
}

func (f *http2HeadersFrame) StreamEnded() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagHeadersEndStream)
}

func (f *http2HeadersFrame) HasPriority() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagHeadersPriority)
}

func http2parseHeadersFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (_ http2Frame, err error) {
	hf := &http2HeadersFrame{
		http2FrameHeader: fh,
	}
	if fh.StreamID == 0 {
		// HEADERS frames MUST be associated with a stream. If a HEADERS frame
		// is received whose stream identifier field is 0x0, the recipient MUST
		// respond with a connection error (Section 5.4.1) of type
		// PROTOCOL_ERROR.
		return nil, http2connError{http2ErrCodeProtocol, "HEADERS frame with stream ID 0"}
	}
	var padLength uint8
	if fh.Flags.Has(http2FlagHeadersPadded) {
		if p, padLength, err = http2readByte(p); err != nil {
			return
		}
	}
	if fh.Flags.Has(http2FlagHeadersPriority) {
		var v uint32
		p, v, err = http2readUint32(p)
		if err != nil {
			return nil, err
		}
		hf.Priority.StreamDep = v & 0x7fffffff
		hf.Priority.Exclusive = (v != hf.Priority.StreamDep) // high bit was set
		p, hf.Priority.Weight, err = http2readByte(p)
		if err != nil {
			return nil, err
		}
	}
	if len(p)-int(padLength) <= 0 {
		return nil, http2streamError(fh.StreamID, http2ErrCodeProtocol)
	}
	hf.headerFragBuf = p[:len(p)-int(padLength)]
	return hf, nil
}

// HeadersFrameParam are the parameters for writing a HEADERS frame.
type http2HeadersFrameParam struct {
	// StreamID is the required Stream ID to initiate.
	StreamID uint32
	// BlockFragment is part (or all) of a Header Block.
	BlockFragment []byte

	// EndStream indicates that the header block is the last that
	// the endpoint will send for the identified stream. Setting
	// this flag causes the stream to enter one of "half closed"
	// states.
	EndStream bool

	// EndHeaders indicates that this frame contains an entire
	// header block and is not followed by any
	// CONTINUATION frames.
	EndHeaders bool

	// PadLength is the optional number of bytes of zeros to add
	// to this frame.
	PadLength uint8

	// Priority, if non-zero, includes stream priority information
	// in the HEADER frame.
	Priority http2PriorityParam
}

// WriteHeaders writes a single HEADERS frame.
//
// This is a low-level header writing method. Encoding headers and
// splitting them into any necessary CONTINUATION frames is handled
// elsewhere.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WriteHeaders(p http2HeadersFrameParam) error {
	if !http2validStreamID(p.StreamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	var flags http2Flags
	if p.PadLength != 0 {
		flags |= http2FlagHeadersPadded
	}
	if p.EndStream {
		flags |= http2FlagHeadersEndStream
	}
	if p.EndHeaders {
		flags |= http2FlagHeadersEndHeaders
	}
	if !p.Priority.IsZero() {
		flags |= http2FlagHeadersPriority
	}
	f.startWrite(http2FrameHeaders, flags, p.StreamID)
	if p.PadLength != 0 {
		f.writeByte(p.PadLength)
	}
	if !p.Priority.IsZero() {
		v := p.Priority.StreamDep
		if !http2validStreamIDOrZero(v) && !f.AllowIllegalWrites {
			return http2errDepStreamID
		}
		if p.Priority.Exclusive {
			v |= 1 << 31
		}
		f.writeUint32(v)
		f.writeByte(p.Priority.Weight)
	}
	f.wbuf = append(f.wbuf, p.BlockFragment...)
	f.wbuf = append(f.wbuf, http2padZeros[:p.PadLength]...)
	return f.endWrite()
}

// A PriorityFrame specifies the sender-advised priority of a stream.
// See http://http2.github.io/http2-spec/#rfc.section.6.3
type http2PriorityFrame struct {
	http2FrameHeader
	http2PriorityParam
}

// PriorityParam are the stream prioritzation parameters.
type http2PriorityParam struct {
	// StreamDep is a 31-bit stream identifier for the
	// stream that this stream depends on. Zero means no
	// dependency.
	StreamDep uint32

	// Exclusive is whether the dependency is exclusive.
	Exclusive bool

	// Weight is the stream's zero-indexed weight. It should be
	// set together with StreamDep, or neither should be set. Per
	// the spec, "Add one to the value to obtain a weight between
	// 1 and 256."
	Weight uint8
}

func (p http2PriorityParam) IsZero() bool {
	return p == http2PriorityParam{}
}

func http2parsePriorityFrame(_ *http2frameCache, fh http2FrameHeader, payload []byte) (http2Frame, error) {
	if fh.StreamID == 0 {
		return nil, http2connError{http2ErrCodeProtocol, "PRIORITY frame with stream ID 0"}
	}
	if len(payload) != 5 {
		return nil, http2connError{http2ErrCodeFrameSize, fmt.Sprintf("PRIORITY frame payload size was %d; want 5", len(payload))}
	}
	v := binary.BigEndian.Uint32(payload[:4])
	streamID := v & 0x7fffffff // mask off high bit
	return &http2PriorityFrame{
		http2FrameHeader: fh,
		http2PriorityParam: http2PriorityParam{
			Weight:    payload[4],
			StreamDep: streamID,
			Exclusive: streamID != v, // was high bit set?
		},
	}, nil
}

// WritePriority writes a PRIORITY frame.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WritePriority(streamID uint32, p http2PriorityParam) error {
	if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	if !http2validStreamIDOrZero(p.StreamDep) {
		return http2errDepStreamID
	}
	f.startWrite(http2FramePriority, 0, streamID)
	v := p.StreamDep
	if p.Exclusive {
		v |= 1 << 31
	}
	f.writeUint32(v)
	f.writeByte(p.Weight)
	return f.endWrite()
}

// A RSTStreamFrame allows for abnormal termination of a stream.
// See http://http2.github.io/http2-spec/#rfc.section.6.4
type http2RSTStreamFrame struct {
	http2FrameHeader
	ErrCode http2ErrCode
}

func http2parseRSTStreamFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	if len(p) != 4 {
		return nil, http2ConnectionError(http2ErrCodeFrameSize)
	}
	if fh.StreamID == 0 {
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	return &http2RSTStreamFrame{fh, http2ErrCode(binary.BigEndian.Uint32(p[:4]))}, nil
}

// WriteRSTStream writes a RST_STREAM frame.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WriteRSTStream(streamID uint32, code http2ErrCode) error {
	if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	f.startWrite(http2FrameRSTStream, 0, streamID)
	f.writeUint32(uint32(code))
	return f.endWrite()
}

// A ContinuationFrame is used to continue a sequence of header block fragments.
// See http://http2.github.io/http2-spec/#rfc.section.6.10
type http2ContinuationFrame struct {
	http2FrameHeader
	headerFragBuf []byte
}

func http2parseContinuationFrame(_ *http2frameCache, fh http2FrameHeader, p []byte) (http2Frame, error) {
	if fh.StreamID == 0 {
		return nil, http2connError{http2ErrCodeProtocol, "CONTINUATION frame with stream ID 0"}
	}
	return &http2ContinuationFrame{fh, p}, nil
}

func (f *http2ContinuationFrame) HeaderBlockFragment() []byte {
	f.checkValid()
	return f.headerFragBuf
}

func (f *http2ContinuationFrame) HeadersEnded() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagContinuationEndHeaders)
}

// WriteContinuation writes a CONTINUATION frame.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WriteContinuation(streamID uint32, endHeaders bool, headerBlockFragment []byte) error {
	if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	var flags http2Flags
	if endHeaders {
		flags |= http2FlagContinuationEndHeaders
	}
	f.startWrite(http2FrameContinuation, flags, streamID)
	f.wbuf = append(f.wbuf, headerBlockFragment...)
	return f.endWrite()
}

// A PushPromiseFrame is used to initiate a server stream.
// See http://http2.github.io/http2-spec/#rfc.section.6.6
type http2PushPromiseFrame struct {
	http2FrameHeader
	PromiseID     uint32
	headerFragBuf []byte // not owned
}

func (f *http2PushPromiseFrame) HeaderBlockFragment() []byte {
	f.checkValid()
	return f.headerFragBuf
}

func (f *http2PushPromiseFrame) HeadersEnded() bool {
	return f.http2FrameHeader.Flags.Has(http2FlagPushPromiseEndHeaders)
}

func http2parsePushPromise(_ *http2frameCache, fh http2FrameHeader, p []byte) (_ http2Frame, err error) {
	pp := &http2PushPromiseFrame{
		http2FrameHeader: fh,
	}
	if pp.StreamID == 0 {
		// PUSH_PROMISE frames MUST be associated with an existing,
		// peer-initiated stream. The stream identifier of a
		// PUSH_PROMISE frame indicates the stream it is associated
		// with. If the stream identifier field specifies the value
		// 0x0, a recipient MUST respond with a connection error
		// (Section 5.4.1) of type PROTOCOL_ERROR.
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	// The PUSH_PROMISE frame includes optional padding.
	// Padding fields and flags are identical to those defined for DATA frames
	var padLength uint8
	if fh.Flags.Has(http2FlagPushPromisePadded) {
		if p, padLength, err = http2readByte(p); err != nil {
			return
		}
	}

	p, pp.PromiseID, err = http2readUint32(p)
	if err != nil {
		return
	}
	pp.PromiseID = pp.PromiseID & (1<<31 - 1)

	if int(padLength) > len(p) {
		// like the DATA frame, error out if padding is longer than the body.
		return nil, http2ConnectionError(http2ErrCodeProtocol)
	}
	pp.headerFragBuf = p[:len(p)-int(padLength)]
	return pp, nil
}

// PushPromiseParam are the parameters for writing a PUSH_PROMISE frame.
type http2PushPromiseParam struct {
	// StreamID is the required Stream ID to initiate.
	StreamID uint32

	// PromiseID is the required Stream ID which this
	// Push Promises
	PromiseID uint32

	// BlockFragment is part (or all) of a Header Block.
	BlockFragment []byte

	// EndHeaders indicates that this frame contains an entire
	// header block and is not followed by any
	// CONTINUATION frames.
	EndHeaders bool

	// PadLength is the optional number of bytes of zeros to add
	// to this frame.
	PadLength uint8
}

// WritePushPromise writes a single PushPromise Frame.
//
// As with Header Frames, This is the low level call for writing
// individual frames. Continuation frames are handled elsewhere.
//
// It will perform exactly one Write to the underlying Writer.
// It is the caller's responsibility to not call other Write methods concurrently.
func (f *http2Framer) WritePushPromise(p http2PushPromiseParam) error {
	if !http2validStreamID(p.StreamID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	var flags http2Flags
	if p.PadLength != 0 {
		flags |= http2FlagPushPromisePadded
	}
	if p.EndHeaders {
		flags |= http2FlagPushPromiseEndHeaders
	}
	f.startWrite(http2FramePushPromise, flags, p.StreamID)
	if p.PadLength != 0 {
		f.writeByte(p.PadLength)
	}
	if !http2validStreamID(p.PromiseID) && !f.AllowIllegalWrites {
		return http2errStreamID
	}
	f.writeUint32(p.PromiseID)
	f.wbuf = append(f.wbuf, p.BlockFragment...)
	f.wbuf = append(f.wbuf, http2padZeros[:p.PadLength]...)
	return f.endWrite()
}

// WriteRawFrame writes a raw frame. This can be used to write
// extension frames unknown to this package.
func (f *http2Framer) WriteRawFrame(t http2FrameType, flags http2Flags, streamID uint32, payload []byte) error {
	f.startWrite(t, flags, streamID)
	f.writeBytes(payload)
	return f.endWrite()
}

func http2readByte(p []byte) (remain []byte, b byte, err error) {
	if len(p) == 0 {
		return nil, 0, io.ErrUnexpectedEOF
	}
	return p[1:], p[0], nil
}

func http2readUint32(p []byte) (remain []byte, v uint32, err error) {
	if len(p) < 4 {
		return nil, 0, io.ErrUnexpectedEOF
	}
	return p[4:], binary.BigEndian.Uint32(p[:4]), nil
}

type http2streamEnder interface {
	StreamEnded() bool
}

type http2headersEnder interface {
	HeadersEnded() bool
}

type http2headersOrContinuation interface {
	http2headersEnder
	HeaderBlockFragment() []byte
}

// A MetaHeadersFrame is the representation of one HEADERS frame and
// zero or more contiguous CONTINUATION frames and the decoding of
// their HPACK-encoded contents.
//
// This type of frame does not appear on the wire and is only returned
// by the Framer when Framer.ReadMetaHeaders is set.
type http2MetaHeadersFrame struct {
	*http2HeadersFrame

	// Fields are the fields contained in the HEADERS and
	// CONTINUATION frames. The underlying slice is owned by the
	// Framer and must not be retained after the next call to
	// ReadFrame.
	//
	// Fields are guaranteed to be in the correct http2 order and
	// not have unknown pseudo header fields or invalid header
	// field names or values. Required pseudo header fields may be
	// missing, however. Use the MetaHeadersFrame.Pseudo accessor
	// method access pseudo headers.
	Fields []hpack.HeaderField

	// Truncated is whether the max header list size limit was hit
	// and Fields is incomplete. The hpack decoder state is still
	// valid, however.
	Truncated bool
}

// PseudoValue returns the given pseudo header field's value.
// The provided pseudo field should not contain the leading colon.
func (mh *http2MetaHeadersFrame) PseudoValue(pseudo string) string {
	for _, hf := range mh.Fields {
		if !hf.IsPseudo() {
			return ""
		}
		if hf.Name[1:] == pseudo {
			return hf.Value
		}
	}
	return ""
}

// RegularFields returns the regular (non-pseudo) header fields of mh.
// The caller does not own the returned slice.
func (mh *http2MetaHeadersFrame) RegularFields() []hpack.HeaderField {
	for i, hf := range mh.Fields {
		if !hf.IsPseudo() {
			return mh.Fields[i:]
		}
	}
	return nil
}

// PseudoFields returns the pseudo header fields of mh.
// The caller does not own the returned slice.
func (mh *http2MetaHeadersFrame) PseudoFields() []hpack.HeaderField {
	for i, hf := range mh.Fields {
		if !hf.IsPseudo() {
			return mh.Fields[:i]
		}
	}
	return mh.Fields
}

func (mh *http2MetaHeadersFrame) checkPseudos() error {
	var isRequest, isResponse bool
	pf := mh.PseudoFields()
	for i, hf := range pf {
		switch hf.Name {
		case ":method", ":path", ":scheme", ":authority":
			isRequest = true
		case ":status":
			isResponse = true
		default:
			return http2pseudoHeaderError(hf.Name)
		}
		// Check for duplicates.
		// This would be a bad algorithm, but N is 4.
		// And this doesn't allocate.
		for _, hf2 := range pf[:i] {
			if hf.Name == hf2.Name {
				return http2duplicatePseudoHeaderError(hf.Name)
			}
		}
	}
	if isRequest && isResponse {
		return http2errMixPseudoHeaderTypes
	}
	return nil
}

func (fr *http2Framer) maxHeaderStringLen() int {
	v := fr.maxHeaderListSize()
	if uint32(int(v)) == v {
		return int(v)
	}
	// They had a crazy big number for MaxHeaderBytes anyway,
	// so give them unlimited header lengths:
	return 0
}

// readMetaFrame returns 0 or more CONTINUATION frames from fr and
// merge them into the provided hf and returns a MetaHeadersFrame
// with the decoded hpack values.
func (fr *http2Framer) readMetaFrame(hf *http2HeadersFrame) (*http2MetaHeadersFrame, error) {
	if fr.AllowIllegalReads {
		return nil, errors.New("illegal use of AllowIllegalReads with ReadMetaHeaders")
	}
	mh := &http2MetaHeadersFrame{
		http2HeadersFrame: hf,
	}
	var remainSize = fr.maxHeaderListSize()
	var sawRegular bool

	var invalid error // pseudo header field errors
	hdec := fr.ReadMetaHeaders
	hdec.SetEmitEnabled(true)
	hdec.SetMaxStringLength(fr.maxHeaderStringLen())
	hdec.SetEmitFunc(func(hf hpack.HeaderField) {
		if http2VerboseLogs && fr.logReads {
			fr.debugReadLoggerf("http2: decoded hpack field %+v", hf)
		}
		if !httpguts.ValidHeaderFieldValue(hf.Value) {
			invalid = http2headerFieldValueError(hf.Value)
		}
		isPseudo := strings.HasPrefix(hf.Name, ":")
		if isPseudo {
			if sawRegular {
				invalid = http2errPseudoAfterRegular
			}
		} else {
			sawRegular = true
			if !http2validWireHeaderFieldName(hf.Name) {
				invalid = http2headerFieldNameError(hf.Name)
			}
		}

		if invalid != nil {
			hdec.SetEmitEnabled(false)
			return
		}

		size := hf.Size()
		if size > remainSize {
			hdec.SetEmitEnabled(false)
			mh.Truncated = true
			return
		}
		remainSize -= size

		mh.Fields = append(mh.Fields, hf)
	})
	// Lose reference to MetaHeadersFrame:
	defer hdec.SetEmitFunc(func(hf hpack.HeaderField) {})

	var hc http2headersOrContinuation = hf
	for {
		frag := hc.HeaderBlockFragment()
		if _, err := hdec.Write(frag); err != nil {
			return nil, http2ConnectionError(http2ErrCodeCompression)
		}

		if hc.HeadersEnded() {
			break
		}
		if f, err := fr.ReadFrame(); err != nil {
			return nil, err
		} else {
			hc = f.(*http2ContinuationFrame) // guaranteed by checkFrameOrder
		}
	}

	mh.http2HeadersFrame.headerFragBuf = nil
	mh.http2HeadersFrame.invalidate()

	if err := hdec.Close(); err != nil {
		return nil, http2ConnectionError(http2ErrCodeCompression)
	}
	if invalid != nil {
		fr.errDetail = invalid
		if http2VerboseLogs {
			log.Printf("http2: invalid header: %v", invalid)
		}
		return nil, http2StreamError{mh.StreamID, http2ErrCodeProtocol, invalid}
	}
	if err := mh.checkPseudos(); err != nil {
		fr.errDetail = err
		if http2VerboseLogs {
			log.Printf("http2: invalid pseudo headers: %v", err)
		}
		return nil, http2StreamError{mh.StreamID, http2ErrCodeProtocol, err}
	}
	return mh, nil
}

func http2summarizeFrame(f http2Frame) string {
	var buf bytes.Buffer
	f.Header().writeDebug(&buf)
	switch f := f.(type) {
	case *http2SettingsFrame:
		n := 0
		f.ForeachSetting(func(s http2Setting) error {
			n++
			if n == 1 {
				buf.WriteString(", settings:")
			}
			fmt.Fprintf(&buf, " %v=%v,", s.ID, s.Val)
			return nil
		})
		if n > 0 {
			buf.Truncate(buf.Len() - 1) // remove trailing comma
		}
	case *http2DataFrame:
		data := f.Data()
		const max = 256
		if len(data) > max {
			data = data[:max]
		}
		fmt.Fprintf(&buf, " data=%q", data)
		if len(f.Data()) > max {
			fmt.Fprintf(&buf, " (%d bytes omitted)", len(f.Data())-max)
		}
	case *http2WindowUpdateFrame:
		if f.StreamID == 0 {
			buf.WriteString(" (conn)")
		}
		fmt.Fprintf(&buf, " incr=%v", f.Increment)
	case *http2PingFrame:
		fmt.Fprintf(&buf, " ping=%q", f.Data[:])
	case *http2GoAwayFrame:
		fmt.Fprintf(&buf, " LastStreamID=%v ErrCode=%v Debug=%q",
			f.LastStreamID, f.ErrCode, f.debugData)
	case *http2RSTStreamFrame:
		fmt.Fprintf(&buf, " ErrCode=%v", f.ErrCode)
	}
	return buf.String()
}

func http2traceHasWroteHeaderField(trace *httptrace.ClientTrace) bool {
	return trace != nil && trace.WroteHeaderField != nil
}

func http2traceWroteHeaderField(trace *httptrace.ClientTrace, k, v string) {
	if trace != nil && trace.WroteHeaderField != nil {
		trace.WroteHeaderField(k, []string{v})
	}
}

func http2traceGot1xxResponseFunc(trace *httptrace.ClientTrace) func(int, textproto.MIMEHeader) error {
	if trace != nil {
		return trace.Got1xxResponse
	}
	return nil
}

var http2DebugGoroutines = os.Getenv("DEBUG_HTTP2_GOROUTINES") == "1"

type http2goroutineLock uint64

func http2newGoroutineLock() http2goroutineLock {
	if !http2DebugGoroutines {
		return 0
	}
	return http2goroutineLock(http2curGoroutineID())
}

func (g http2goroutineLock) check() {
	if !http2DebugGoroutines {
		return
	}
	if http2curGoroutineID() != uint64(g) {
		panic("running on the wrong goroutine")
	}
}

func (g http2goroutineLock) checkNotOn() {
	if !http2DebugGoroutines {
		return
	}
	if http2curGoroutineID() == uint64(g) {
		panic("running on the wrong goroutine")
	}
}

var http2goroutineSpace = []byte("goroutine ")

func http2curGoroutineID() uint64 {
	bp := http2littleBuf.Get().(*[]byte)
	defer http2littleBuf.Put(bp)
	b := *bp
	b = b[:runtime.Stack(b, false)]
	// Parse the 4707 out of "goroutine 4707 ["
	b = bytes.TrimPrefix(b, http2goroutineSpace)
	i := bytes.IndexByte(b, ' ')
	if i < 0 {
		panic(fmt.Sprintf("No space found in %q", b))
	}
	b = b[:i]
	n, err := http2parseUintBytes(b, 10, 64)
	if err != nil {
		panic(fmt.Sprintf("Failed to parse goroutine ID out of %q: %v", b, err))
	}
	return n
}

var http2littleBuf = sync.Pool{
	New: func() interface{} {
		buf := make([]byte, 64)
		return &buf
	},
}

// parseUintBytes is like strconv.ParseUint, but using a []byte.
func http2parseUintBytes(s []byte, base int, bitSize int) (n uint64, err error) {
	var cutoff, maxVal uint64

	if bitSize == 0 {
		bitSize = int(strconv.IntSize)
	}

	s0 := s
	switch {
	case len(s) < 1:
		err = strconv.ErrSyntax
		goto Error

	case 2 <= base && base <= 36:
		// valid base; nothing to do

	case base == 0:
		// Look for octal, hex prefix.
		switch {
		case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'):
			base = 16
			s = s[2:]
			if len(s) < 1 {
				err = strconv.ErrSyntax
				goto Error
			}
		case s[0] == '0':
			base = 8
		default:
			base = 10
		}

	default:
		err = errors.New("invalid base " + strconv.Itoa(base))
		goto Error
	}

	n = 0
	cutoff = http2cutoff64(base)
	maxVal = 1<<uint(bitSize) - 1

	for i := 0; i < len(s); i++ {
		var v byte
		d := s[i]
		switch {
		case '0' <= d && d <= '9':
			v = d - '0'
		case 'a' <= d && d <= 'z':
			v = d - 'a' + 10
		case 'A' <= d && d <= 'Z':
			v = d - 'A' + 10
		default:
			n = 0
			err = strconv.ErrSyntax
			goto Error
		}
		if int(v) >= base {
			n = 0
			err = strconv.ErrSyntax
			goto Error
		}

		if n >= cutoff {
			// n*base overflows
			n = 1<<64 - 1
			err = strconv.ErrRange
			goto Error
		}
		n *= uint64(base)

		n1 := n + uint64(v)
		if n1 < n || n1 > maxVal {
			// n+v overflows
			n = 1<<64 - 1
			err = strconv.ErrRange
			goto Error
		}
		n = n1
	}

	return n, nil

Error:
	return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err}
}

// Return the first number n such that n*base >= 1<<64.
func http2cutoff64(base int) uint64 {
	if base < 2 {
		return 0
	}
	return (1<<64-1)/uint64(base) + 1
}

var (
	http2commonBuildOnce   sync.Once
	http2commonLowerHeader map[string]string // Go-Canonical-Case -> lower-case
	http2commonCanonHeader map[string]string // lower-case -> Go-Canonical-Case
)

func http2buildCommonHeaderMapsOnce() {
	http2commonBuildOnce.Do(http2buildCommonHeaderMaps)
}

func http2buildCommonHeaderMaps() {
	common := []string{
		"accept",
		"accept-charset",
		"accept-encoding",
		"accept-language",
		"accept-ranges",
		"age",
		"access-control-allow-origin",
		"allow",
		"authorization",
		"cache-control",
		"content-disposition",
		"content-encoding",
		"content-language",
		"content-length",
		"content-location",
		"content-range",
		"content-type",
		"cookie",
		"date",
		"etag",
		"expect",
		"expires",
		"from",
		"host",
		"if-match",
		"if-modified-since",
		"if-none-match",
		"if-unmodified-since",
		"last-modified",
		"link",
		"location",
		"max-forwards",
		"proxy-authenticate",
		"proxy-authorization",
		"range",
		"referer",
		"refresh",
		"retry-after",
		"server",
		"set-cookie",
		"strict-transport-security",
		"trailer",
		"transfer-encoding",
		"user-agent",
		"vary",
		"via",
		"www-authenticate",
	}
	http2commonLowerHeader = make(map[string]string, len(common))
	http2commonCanonHeader = make(map[string]string, len(common))
	for _, v := range common {
		chk := CanonicalHeaderKey(v)
		http2commonLowerHeader[chk] = v
		http2commonCanonHeader[v] = chk
	}
}

func http2lowerHeader(v string) string {
	http2buildCommonHeaderMapsOnce()
	if s, ok := http2commonLowerHeader[v]; ok {
		return s
	}
	return strings.ToLower(v)
}

var (
	http2VerboseLogs    bool
	http2logFrameWrites bool
	http2logFrameReads  bool
	http2inTests        bool
)

func init() {
	e := os.Getenv("GODEBUG")
	if strings.Contains(e, "http2debug=1") {
		http2VerboseLogs = true
	}
	if strings.Contains(e, "http2debug=2") {
		http2VerboseLogs = true
		http2logFrameWrites = true
		http2logFrameReads = true
	}
}

const (
	// ClientPreface is the string that must be sent by new
	// connections from clients.
	http2ClientPreface = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"

	// SETTINGS_MAX_FRAME_SIZE default
	// http://http2.github.io/http2-spec/#rfc.section.6.5.2
	http2initialMaxFrameSize = 16384

	// NextProtoTLS is the NPN/ALPN protocol negotiated during
	// HTTP/2's TLS setup.
	http2NextProtoTLS = "h2"

	// http://http2.github.io/http2-spec/#SettingValues
	http2initialHeaderTableSize = 4096

	http2initialWindowSize = 65535 // 6.9.2 Initial Flow Control Window Size

	http2defaultMaxReadFrameSize = 1 << 20
)

var (
	http2clientPreface = []byte(http2ClientPreface)
)

type http2streamState int

// HTTP/2 stream states.
//
// See http://tools.ietf.org/html/rfc7540#section-5.1.
//
// For simplicity, the server code merges "reserved (local)" into
// "half-closed (remote)". This is one less state transition to track.
// The only downside is that we send PUSH_PROMISEs slightly less
// liberally than allowable. More discussion here:
// https://lists.w3.org/Archives/Public/ietf-http-wg/2016JulSep/0599.html
//
// "reserved (remote)" is omitted since the client code does not
// support server push.
const (
	http2stateIdle http2streamState = iota
	http2stateOpen
	http2stateHalfClosedLocal
	http2stateHalfClosedRemote
	http2stateClosed
)

var http2stateName = [...]string{
	http2stateIdle:             "Idle",
	http2stateOpen:             "Open",
	http2stateHalfClosedLocal:  "HalfClosedLocal",
	http2stateHalfClosedRemote: "HalfClosedRemote",
	http2stateClosed:           "Closed",
}

func (st http2streamState) String() string {
	return http2stateName[st]
}

// Setting is a setting parameter: which setting it is, and its value.
type http2Setting struct {
	// ID is which setting is being set.
	// See http://http2.github.io/http2-spec/#SettingValues
	ID http2SettingID

	// Val is the value.
	Val uint32
}

func (s http2Setting) String() string {
	return fmt.Sprintf("[%v = %d]", s.ID, s.Val)
}

// Valid reports whether the setting is valid.
func (s http2Setting) Valid() error {
	// Limits and error codes from 6.5.2 Defined SETTINGS Parameters
	switch s.ID {
	case http2SettingEnablePush:
		if s.Val != 1 && s.Val != 0 {
			return http2ConnectionError(http2ErrCodeProtocol)
		}
	case http2SettingInitialWindowSize:
		if s.Val > 1<<31-1 {
			return http2ConnectionError(http2ErrCodeFlowControl)
		}
	case http2SettingMaxFrameSize:
		if s.Val < 16384 || s.Val > 1<<24-1 {
			return http2ConnectionError(http2ErrCodeProtocol)
		}
	}
	return nil
}

// A SettingID is an HTTP/2 setting as defined in
// http://http2.github.io/http2-spec/#iana-settings
type http2SettingID uint16

const (
	http2SettingHeaderTableSize      http2SettingID = 0x1
	http2SettingEnablePush           http2SettingID = 0x2
	http2SettingMaxConcurrentStreams http2SettingID = 0x3
	http2SettingInitialWindowSize    http2SettingID = 0x4
	http2SettingMaxFrameSize         http2SettingID = 0x5
	http2SettingMaxHeaderListSize    http2SettingID = 0x6
)

var http2settingName = map[http2SettingID]string{
	http2SettingHeaderTableSize:      "HEADER_TABLE_SIZE",
	http2SettingEnablePush:           "ENABLE_PUSH",
	http2SettingMaxConcurrentStreams: "MAX_CONCURRENT_STREAMS",
	http2SettingInitialWindowSize:    "INITIAL_WINDOW_SIZE",
	http2SettingMaxFrameSize:         "MAX_FRAME_SIZE",
	http2SettingMaxHeaderListSize:    "MAX_HEADER_LIST_SIZE",
}

func (s http2SettingID) String() string {
	if v, ok := http2settingName[s]; ok {
		return v
	}
	return fmt.Sprintf("UNKNOWN_SETTING_%d", uint16(s))
}

// validWireHeaderFieldName reports whether v is a valid header field
// name (key). See httpguts.ValidHeaderName for the base rules.
//
// Further, http2 says:
//   "Just as in HTTP/1.x, header field names are strings of ASCII
//   characters that are compared in a case-insensitive
//   fashion. However, header field names MUST be converted to
//   lowercase prior to their encoding in HTTP/2. "
func http2validWireHeaderFieldName(v string) bool {
	if len(v) == 0 {
		return false
	}
	for _, r := range v {
		if !httpguts.IsTokenRune(r) {
			return false
		}
		if 'A' <= r && r <= 'Z' {
			return false
		}
	}
	return true
}

func http2httpCodeString(code int) string {
	switch code {
	case 200:
		return "200"
	case 404:
		return "404"
	}
	return strconv.Itoa(code)
}

// from pkg io
type http2stringWriter interface {
	WriteString(s string) (n int, err error)
}

// A gate lets two goroutines coordinate their activities.
type http2gate chan struct{}

func (g http2gate) Done() { g <- struct{}{} }

func (g http2gate) Wait() { <-g }

// A closeWaiter is like a sync.WaitGroup but only goes 1 to 0 (open to closed).
type http2closeWaiter chan struct{}

// Init makes a closeWaiter usable.
// It exists because so a closeWaiter value can be placed inside a
// larger struct and have the Mutex and Cond's memory in the same
// allocation.
func (cw *http2closeWaiter) Init() {
	*cw = make(chan struct{})
}

// Close marks the closeWaiter as closed and unblocks any waiters.
func (cw http2closeWaiter) Close() {
	close(cw)
}

// Wait waits for the closeWaiter to become closed.
func (cw http2closeWaiter) Wait() {
	<-cw
}

// bufferedWriter is a buffered writer that writes to w.
// Its buffered writer is lazily allocated as needed, to minimize
// idle memory usage with many connections.
type http2bufferedWriter struct {
	_  http2incomparable
	w  io.Writer     // immutable
	bw *bufio.Writer // non-nil when data is buffered
}

func http2newBufferedWriter(w io.Writer) *http2bufferedWriter {
	return &http2bufferedWriter{w: w}
}

// bufWriterPoolBufferSize is the size of bufio.Writer's
// buffers created using bufWriterPool.
//
// TODO: pick a less arbitrary value? this is a bit under
// (3 x typical 1500 byte MTU) at least. Other than that,
// not much thought went into it.
const http2bufWriterPoolBufferSize = 4 << 10

var http2bufWriterPool = sync.Pool{
	New: func() interface{} {
		return bufio.NewWriterSize(nil, http2bufWriterPoolBufferSize)
	},
}

func (w *http2bufferedWriter) Available() int {
	if w.bw == nil {
		return http2bufWriterPoolBufferSize
	}
	return w.bw.Available()
}

func (w *http2bufferedWriter) Write(p []byte) (n int, err error) {
	if w.bw == nil {
		bw := http2bufWriterPool.Get().(*bufio.Writer)
		bw.Reset(w.w)
		w.bw = bw
	}
	return w.bw.Write(p)
}

func (w *http2bufferedWriter) Flush() error {
	bw := w.bw
	if bw == nil {
		return nil
	}
	err := bw.Flush()
	bw.Reset(nil)
	http2bufWriterPool.Put(bw)
	w.bw = nil
	return err
}

func http2mustUint31(v int32) uint32 {
	if v < 0 || v > 2147483647 {
		panic("out of range")
	}
	return uint32(v)
}

// bodyAllowedForStatus reports whether a given response status code
// permits a body. See RFC 7230, section 3.3.
func http2bodyAllowedForStatus(status int) bool {
	switch {
	case status >= 100 && status <= 199:
		return false
	case status == 204:
		return false
	case status == 304:
		return false
	}
	return true
}

type http2httpError struct {
	_       http2incomparable
	msg     string
	timeout bool
}

func (e *http2httpError) Error() string { return e.msg }

func (e *http2httpError) Timeout() bool { return e.timeout }

func (e *http2httpError) Temporary() bool { return true }

var http2errTimeout error = &http2httpError{msg: "http2: timeout awaiting response headers", timeout: true}

type http2connectionStater interface {
	ConnectionState() tls.ConnectionState
}

var http2sorterPool = sync.Pool{New: func() interface{} { return new(http2sorter) }}

type http2sorter struct {
	v []string // owned by sorter
}

func (s *http2sorter) Len() int { return len(s.v) }

func (s *http2sorter) Swap(i, j int) { s.v[i], s.v[j] = s.v[j], s.v[i] }

func (s *http2sorter) Less(i, j int) bool { return s.v[i] < s.v[j] }

// Keys returns the sorted keys of h.
//
// The returned slice is only valid until s used again or returned to
// its pool.
func (s *http2sorter) Keys(h Header) []string {
	keys := s.v[:0]
	for k := range h {
		keys = append(keys, k)
	}
	s.v = keys
	sort.Sort(s)
	return keys
}

func (s *http2sorter) SortStrings(ss []string) {
	// Our sorter works on s.v, which sorter owns, so
	// stash it away while we sort the user's buffer.
	save := s.v
	s.v = ss
	sort.Sort(s)
	s.v = save
}

// validPseudoPath reports whether v is a valid :path pseudo-header
// value. It must be either:
//
//     *) a non-empty string starting with '/'
//     *) the string '*', for OPTIONS requests.
//
// For now this is only used a quick check for deciding when to clean
// up Opaque URLs before sending requests from the Transport.
// See golang.org/issue/16847
//
// We used to enforce that the path also didn't start with "//", but
// Google's GFE accepts such paths and Chrome sends them, so ignore
// that part of the spec. See golang.org/issue/19103.
func http2validPseudoPath(v string) bool {
	return (len(v) > 0 && v[0] == '/') || v == "*"
}

// incomparable is a zero-width, non-comparable type. Adding it to a struct
// makes that struct also non-comparable, and generally doesn't add
// any size (as long as it's first).
type http2incomparable [0]func()

// pipe is a goroutine-safe io.Reader/io.Writer pair. It's like
// io.Pipe except there are no PipeReader/PipeWriter halves, and the
// underlying buffer is an interface. (io.Pipe is always unbuffered)
type http2pipe struct {
	mu       sync.Mutex
	c        sync.Cond       // c.L lazily initialized to &p.mu
	b        http2pipeBuffer // nil when done reading
	unread   int             // bytes unread when done
	err      error           // read error once empty. non-nil means closed.
	breakErr error           // immediate read error (caller doesn't see rest of b)
	donec    chan struct{}   // closed on error
	readFn   func()          // optional code to run in Read before error
}

type http2pipeBuffer interface {
	Len() int
	io.Writer
	io.Reader
}

func (p *http2pipe) Len() int {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.b == nil {
		return p.unread
	}
	return p.b.Len()
}

// Read waits until data is available and copies bytes
// from the buffer into p.
func (p *http2pipe) Read(d []byte) (n int, err error) {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.c.L == nil {
		p.c.L = &p.mu
	}
	for {
		if p.breakErr != nil {
			return 0, p.breakErr
		}
		if p.b != nil && p.b.Len() > 0 {
			return p.b.Read(d)
		}
		if p.err != nil {
			if p.readFn != nil {
				p.readFn()     // e.g. copy trailers
				p.readFn = nil // not sticky like p.err
			}
			p.b = nil
			return 0, p.err
		}
		p.c.Wait()
	}
}

var http2errClosedPipeWrite = errors.New("write on closed buffer")

// Write copies bytes from p into the buffer and wakes a reader.
// It is an error to write more data than the buffer can hold.
func (p *http2pipe) Write(d []byte) (n int, err error) {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.c.L == nil {
		p.c.L = &p.mu
	}
	defer p.c.Signal()
	if p.err != nil {
		return 0, http2errClosedPipeWrite
	}
	if p.breakErr != nil {
		p.unread += len(d)
		return len(d), nil // discard when there is no reader
	}
	return p.b.Write(d)
}

// CloseWithError causes the next Read (waking up a current blocked
// Read if needed) to return the provided err after all data has been
// read.
//
// The error must be non-nil.
func (p *http2pipe) CloseWithError(err error) { p.closeWithError(&p.err, err, nil) }

// BreakWithError causes the next Read (waking up a current blocked
// Read if needed) to return the provided err immediately, without
// waiting for unread data.
func (p *http2pipe) BreakWithError(err error) { p.closeWithError(&p.breakErr, err, nil) }

// closeWithErrorAndCode is like CloseWithError but also sets some code to run
// in the caller's goroutine before returning the error.
func (p *http2pipe) closeWithErrorAndCode(err error, fn func()) { p.closeWithError(&p.err, err, fn) }

func (p *http2pipe) closeWithError(dst *error, err error, fn func()) {
	if err == nil {
		panic("err must be non-nil")
	}
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.c.L == nil {
		p.c.L = &p.mu
	}
	defer p.c.Signal()
	if *dst != nil {
		// Already been done.
		return
	}
	p.readFn = fn
	if dst == &p.breakErr {
		if p.b != nil {
			p.unread += p.b.Len()
		}
		p.b = nil
	}
	*dst = err
	p.closeDoneLocked()
}

// requires p.mu be held.
func (p *http2pipe) closeDoneLocked() {
	if p.donec == nil {
		return
	}
	// Close if unclosed. This isn't racy since we always
	// hold p.mu while closing.
	select {
	case <-p.donec:
	default:
		close(p.donec)
	}
}

// Err returns the error (if any) first set by BreakWithError or CloseWithError.
func (p *http2pipe) Err() error {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.breakErr != nil {
		return p.breakErr
	}
	return p.err
}

// Done returns a channel which is closed if and when this pipe is closed
// with CloseWithError.
func (p *http2pipe) Done() <-chan struct{} {
	p.mu.Lock()
	defer p.mu.Unlock()
	if p.donec == nil {
		p.donec = make(chan struct{})
		if p.err != nil || p.breakErr != nil {
			// Already hit an error.
			p.closeDoneLocked()
		}
	}
	return p.donec
}

const (
	http2prefaceTimeout         = 10 * time.Second
	http2firstSettingsTimeout   = 2 * time.Second // should be in-flight with preface anyway
	http2handlerChunkWriteSize  = 4 << 10
	http2defaultMaxStreams      = 250 // TODO: make this 100 as the GFE seems to?
	http2maxQueuedControlFrames = 10000
)

var (
	http2errClientDisconnected = errors.New("client disconnected")
	http2errClosedBody         = errors.New("body closed by handler")
	http2errHandlerComplete    = errors.New("http2: request body closed due to handler exiting")
	http2errStreamClosed       = errors.New("http2: stream closed")
)

var http2responseWriterStatePool = sync.Pool{
	New: func() interface{} {
		rws := &http2responseWriterState{}
		rws.bw = bufio.NewWriterSize(http2chunkWriter{rws}, http2handlerChunkWriteSize)
		return rws
	},
}

// Test hooks.
var (
	http2testHookOnConn        func()
	http2testHookGetServerConn func(*http2serverConn)
	http2testHookOnPanicMu     *sync.Mutex // nil except in tests
	http2testHookOnPanic       func(sc *http2serverConn, panicVal interface{}) (rePanic bool)
)

// Server is an HTTP/2 server.
type http2Server struct {
	// MaxHandlers limits the number of http.Handler ServeHTTP goroutines
	// which may run at a time over all connections.
	// Negative or zero no limit.
	// TODO: implement
	MaxHandlers int

	// MaxConcurrentStreams optionally specifies the number of
	// concurrent streams that each client may have open at a
	// time. This is unrelated to the number of http.Handler goroutines
	// which may be active globally, which is MaxHandlers.
	// If zero, MaxConcurrentStreams defaults to at least 100, per
	// the HTTP/2 spec's recommendations.
	MaxConcurrentStreams uint32

	// MaxReadFrameSize optionally specifies the largest frame
	// this server is willing to read. A valid value is between
	// 16k and 16M, inclusive. If zero or otherwise invalid, a
	// default value is used.
	MaxReadFrameSize uint32

	// PermitProhibitedCipherSuites, if true, permits the use of
	// cipher suites prohibited by the HTTP/2 spec.
	PermitProhibitedCipherSuites bool

	// IdleTimeout specifies how long until idle clients should be
	// closed with a GOAWAY frame. PING frames are not considered
	// activity for the purposes of IdleTimeout.
	IdleTimeout time.Duration

	// MaxUploadBufferPerConnection is the size of the initial flow
	// control window for each connections. The HTTP/2 spec does not
	// allow this to be smaller than 65535 or larger than 2^32-1.
	// If the value is outside this range, a default value will be
	// used instead.
	MaxUploadBufferPerConnection int32

	// MaxUploadBufferPerStream is the size of the initial flow control
	// window for each stream. The HTTP/2 spec does not allow this to
	// be larger than 2^32-1. If the value is zero or larger than the
	// maximum, a default value will be used instead.
	MaxUploadBufferPerStream int32

	// NewWriteScheduler constructs a write scheduler for a connection.
	// If nil, a default scheduler is chosen.
	NewWriteScheduler func() http2WriteScheduler

	// Internal state. This is a pointer (rather than embedded directly)
	// so that we don't embed a Mutex in this struct, which will make the
	// struct non-copyable, which might break some callers.
	state *http2serverInternalState
}

func (s *http2Server) initialConnRecvWindowSize() int32 {
	if s.MaxUploadBufferPerConnection > http2initialWindowSize {
		return s.MaxUploadBufferPerConnection
	}
	return 1 << 20
}

func (s *http2Server) initialStreamRecvWindowSize() int32 {
	if s.MaxUploadBufferPerStream > 0 {
		return s.MaxUploadBufferPerStream
	}
	return 1 << 20
}

func (s *http2Server) maxReadFrameSize() uint32 {
	if v := s.MaxReadFrameSize; v >= http2minMaxFrameSize && v <= http2maxFrameSize {
		return v
	}
	return http2defaultMaxReadFrameSize
}

func (s *http2Server) maxConcurrentStreams() uint32 {
	if v := s.MaxConcurrentStreams; v > 0 {
		return v
	}
	return http2defaultMaxStreams
}

// maxQueuedControlFrames is the maximum number of control frames like
// SETTINGS, PING and RST_STREAM that will be queued for writing before
// the connection is closed to prevent memory exhaustion attacks.
func (s *http2Server) maxQueuedControlFrames() int {
	// TODO: if anybody asks, add a Server field, and remember to define the
	// behavior of negative values.
	return http2maxQueuedControlFrames
}

type http2serverInternalState struct {
	mu          sync.Mutex
	activeConns map[*http2serverConn]struct{}
}

func (s *http2serverInternalState) registerConn(sc *http2serverConn) {
	if s == nil {
		return // if the Server was used without calling ConfigureServer
	}
	s.mu.Lock()
	s.activeConns[sc] = struct{}{}
	s.mu.Unlock()
}

func (s *http2serverInternalState) unregisterConn(sc *http2serverConn) {
	if s == nil {
		return // if the Server was used without calling ConfigureServer
	}
	s.mu.Lock()
	delete(s.activeConns, sc)
	s.mu.Unlock()
}

func (s *http2serverInternalState) startGracefulShutdown() {
	if s == nil {
		return // if the Server was used without calling ConfigureServer
	}
	s.mu.Lock()
	for sc := range s.activeConns {
		sc.startGracefulShutdown()
	}
	s.mu.Unlock()
}

// ConfigureServer adds HTTP/2 support to a net/http Server.
//
// The configuration conf may be nil.
//
// ConfigureServer must be called before s begins serving.
func http2ConfigureServer(s *Server, conf *http2Server) error {
	if s == nil {
		panic("nil *http.Server")
	}
	if conf == nil {
		conf = new(http2Server)
	}
	conf.state = &http2serverInternalState{activeConns: make(map[*http2serverConn]struct{})}
	if h1, h2 := s, conf; h2.IdleTimeout == 0 {
		if h1.IdleTimeout != 0 {
			h2.IdleTimeout = h1.IdleTimeout
		} else {
			h2.IdleTimeout = h1.ReadTimeout
		}
	}
	s.RegisterOnShutdown(conf.state.startGracefulShutdown)

	if s.TLSConfig == nil {
		s.TLSConfig = new(tls.Config)
	} else if s.TLSConfig.CipherSuites != nil {
		// If they already provided a CipherSuite list, return
		// an error if it has a bad order or is missing
		// ECDHE_RSA_WITH_AES_128_GCM_SHA256 or ECDHE_ECDSA_WITH_AES_128_GCM_SHA256.
		haveRequired := false
		sawBad := false
		for i, cs := range s.TLSConfig.CipherSuites {
			switch cs {
			case tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
				// Alternative MTI cipher to not discourage ECDSA-only servers.
				// See http://golang.org/cl/30721 for further information.
				tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
				haveRequired = true
			}
			if http2isBadCipher(cs) {
				sawBad = true
			} else if sawBad {
				return fmt.Errorf("http2: TLSConfig.CipherSuites index %d contains an HTTP/2-approved cipher suite (%#04x), but it comes after unapproved cipher suites. With this configuration, clients that don't support previous, approved cipher suites may be given an unapproved one and reject the connection.", i, cs)
			}
		}
		if !haveRequired {
			return fmt.Errorf("http2: TLSConfig.CipherSuites is missing an HTTP/2-required AES_128_GCM_SHA256 cipher (need at least one of TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 or TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256).")
		}
	}

	// Note: not setting MinVersion to tls.VersionTLS12,
	// as we don't want to interfere with HTTP/1.1 traffic
	// on the user's server. We enforce TLS 1.2 later once
	// we accept a connection. Ideally this should be done
	// during next-proto selection, but using TLS <1.2 with
	// HTTP/2 is still the client's bug.

	s.TLSConfig.PreferServerCipherSuites = true

	haveNPN := false
	for _, p := range s.TLSConfig.NextProtos {
		if p == http2NextProtoTLS {
			haveNPN = true
			break
		}
	}
	if !haveNPN {
		s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, http2NextProtoTLS)
	}

	if s.TLSNextProto == nil {
		s.TLSNextProto = map[string]func(*Server, *tls.Conn, Handler){}
	}
	protoHandler := func(hs *Server, c *tls.Conn, h Handler) {
		if http2testHookOnConn != nil {
			http2testHookOnConn()
		}
		// The TLSNextProto interface predates contexts, so
		// the net/http package passes down its per-connection
		// base context via an exported but unadvertised
		// method on the Handler. This is for internal
		// net/http<=>http2 use only.
		var ctx context.Context
		type baseContexter interface {
			BaseContext() context.Context
		}
		if bc, ok := h.(baseContexter); ok {
			ctx = bc.BaseContext()
		}
		conf.ServeConn(c, &http2ServeConnOpts{
			Context:    ctx,
			Handler:    h,
			BaseConfig: hs,
		})
	}
	s.TLSNextProto[http2NextProtoTLS] = protoHandler
	return nil
}

// ServeConnOpts are options for the Server.ServeConn method.
type http2ServeConnOpts struct {
	// Context is the base context to use.
	// If nil, context.Background is used.
	Context context.Context

	// BaseConfig optionally sets the base configuration
	// for values. If nil, defaults are used.
	BaseConfig *Server

	// Handler specifies which handler to use for processing
	// requests. If nil, BaseConfig.Handler is used. If BaseConfig
	// or BaseConfig.Handler is nil, http.DefaultServeMux is used.
	Handler Handler
}

func (o *http2ServeConnOpts) context() context.Context {
	if o != nil && o.Context != nil {
		return o.Context
	}
	return context.Background()
}

func (o *http2ServeConnOpts) baseConfig() *Server {
	if o != nil && o.BaseConfig != nil {
		return o.BaseConfig
	}
	return new(Server)
}

func (o *http2ServeConnOpts) handler() Handler {
	if o != nil {
		if o.Handler != nil {
			return o.Handler
		}
		if o.BaseConfig != nil && o.BaseConfig.Handler != nil {
			return o.BaseConfig.Handler
		}
	}
	return DefaultServeMux
}

// ServeConn serves HTTP/2 requests on the provided connection and
// blocks until the connection is no longer readable.
//
// ServeConn starts speaking HTTP/2 assuming that c has not had any
// reads or writes. It writes its initial settings frame and expects
// to be able to read the preface and settings frame from the
// client. If c has a ConnectionState method like a *tls.Conn, the
// ConnectionState is used to verify the TLS ciphersuite and to set
// the Request.TLS field in Handlers.
//
// ServeConn does not support h2c by itself. Any h2c support must be
// implemented in terms of providing a suitably-behaving net.Conn.
//
// The opts parameter is optional. If nil, default values are used.
func (s *http2Server) ServeConn(c net.Conn, opts *http2ServeConnOpts) {
	baseCtx, cancel := http2serverConnBaseContext(c, opts)
	defer cancel()

	sc := &http2serverConn{
		srv:                         s,
		hs:                          opts.baseConfig(),
		conn:                        c,
		baseCtx:                     baseCtx,
		remoteAddrStr:               c.RemoteAddr().String(),
		bw:                          http2newBufferedWriter(c),
		handler:                     opts.handler(),
		streams:                     make(map[uint32]*http2stream),
		readFrameCh:                 make(chan http2readFrameResult),
		wantWriteFrameCh:            make(chan http2FrameWriteRequest, 8),
		serveMsgCh:                  make(chan interface{}, 8),
		wroteFrameCh:                make(chan http2frameWriteResult, 1), // buffered; one send in writeFrameAsync
		bodyReadCh:                  make(chan http2bodyReadMsg),         // buffering doesn't matter either way
		doneServing:                 make(chan struct{}),
		clientMaxStreams:            math.MaxUint32, // Section 6.5.2: "Initially, there is no limit to this value"
		advMaxStreams:               s.maxConcurrentStreams(),
		initialStreamSendWindowSize: http2initialWindowSize,
		maxFrameSize:                http2initialMaxFrameSize,
		headerTableSize:             http2initialHeaderTableSize,
		serveG:                      http2newGoroutineLock(),
		pushEnabled:                 true,
	}

	s.state.registerConn(sc)
	defer s.state.unregisterConn(sc)

	// The net/http package sets the write deadline from the
	// http.Server.WriteTimeout during the TLS handshake, but then
	// passes the connection off to us with the deadline already set.
	// Write deadlines are set per stream in serverConn.newStream.
	// Disarm the net.Conn write deadline here.
	if sc.hs.WriteTimeout != 0 {
		sc.conn.SetWriteDeadline(time.Time{})
	}

	if s.NewWriteScheduler != nil {
		sc.writeSched = s.NewWriteScheduler()
	} else {
		sc.writeSched = http2NewRandomWriteScheduler()
	}

	// These start at the RFC-specified defaults. If there is a higher
	// configured value for inflow, that will be updated when we send a
	// WINDOW_UPDATE shortly after sending SETTINGS.
	sc.flow.add(http2initialWindowSize)
	sc.inflow.add(http2initialWindowSize)
	sc.hpackEncoder = hpack.NewEncoder(&sc.headerWriteBuf)

	fr := http2NewFramer(sc.bw, c)
	fr.ReadMetaHeaders = hpack.NewDecoder(http2initialHeaderTableSize, nil)
	fr.MaxHeaderListSize = sc.maxHeaderListSize()
	fr.SetMaxReadFrameSize(s.maxReadFrameSize())
	sc.framer = fr

	if tc, ok := c.(http2connectionStater); ok {
		sc.tlsState = new(tls.ConnectionState)
		*sc.tlsState = tc.ConnectionState()
		// 9.2 Use of TLS Features
		// An implementation of HTTP/2 over TLS MUST use TLS
		// 1.2 or higher with the restrictions on feature set
		// and cipher suite described in this section. Due to
		// implementation limitations, it might not be
		// possible to fail TLS negotiation. An endpoint MUST
		// immediately terminate an HTTP/2 connection that
		// does not meet the TLS requirements described in
		// this section with a connection error (Section
		// 5.4.1) of type INADEQUATE_SECURITY.
		if sc.tlsState.Version < tls.VersionTLS12 {
			sc.rejectConn(http2ErrCodeInadequateSecurity, "TLS version too low")
			return
		}

		if sc.tlsState.ServerName == "" {
			// Client must use SNI, but we don't enforce that anymore,
			// since it was causing problems when connecting to bare IP
			// addresses during development.
			//
			// TODO: optionally enforce? Or enforce at the time we receive
			// a new request, and verify the ServerName matches the :authority?
			// But that precludes proxy situations, perhaps.
			//
			// So for now, do nothing here again.
		}

		if !s.PermitProhibitedCipherSuites && http2isBadCipher(sc.tlsState.CipherSuite) {
			// "Endpoints MAY choose to generate a connection error
			// (Section 5.4.1) of type INADEQUATE_SECURITY if one of
			// the prohibited cipher suites are negotiated."
			//
			// We choose that. In my opinion, the spec is weak
			// here. It also says both parties must support at least
			// TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 so there's no
			// excuses here. If we really must, we could allow an
			// "AllowInsecureWeakCiphers" option on the server later.
			// Let's see how it plays out first.
			sc.rejectConn(http2ErrCodeInadequateSecurity, fmt.Sprintf("Prohibited TLS 1.2 Cipher Suite: %x", sc.tlsState.CipherSuite))
			return
		}
	}

	if hook := http2testHookGetServerConn; hook != nil {
		hook(sc)
	}
	sc.serve()
}

func http2serverConnBaseContext(c net.Conn, opts *http2ServeConnOpts) (ctx context.Context, cancel func()) {
	ctx, cancel = context.WithCancel(opts.context())
	ctx = context.WithValue(ctx, LocalAddrContextKey, c.LocalAddr())
	if hs := opts.baseConfig(); hs != nil {
		ctx = context.WithValue(ctx, ServerContextKey, hs)
	}
	return
}

func (sc *http2serverConn) rejectConn(err http2ErrCode, debug string) {
	sc.vlogf("http2: server rejecting conn: %v, %s", err, debug)
	// ignoring errors. hanging up anyway.
	sc.framer.WriteGoAway(0, err, []byte(debug))
	sc.bw.Flush()
	sc.conn.Close()
}

type http2serverConn struct {
	// Immutable:
	srv              *http2Server
	hs               *Server
	conn             net.Conn
	bw               *http2bufferedWriter // writing to conn
	handler          Handler
	baseCtx          context.Context
	framer           *http2Framer
	doneServing      chan struct{}               // closed when serverConn.serve ends
	readFrameCh      chan http2readFrameResult   // written by serverConn.readFrames
	wantWriteFrameCh chan http2FrameWriteRequest // from handlers -> serve
	wroteFrameCh     chan http2frameWriteResult  // from writeFrameAsync -> serve, tickles more frame writes
	bodyReadCh       chan http2bodyReadMsg       // from handlers -> serve
	serveMsgCh       chan interface{}            // misc messages & code to send to / run on the serve loop
	flow             http2flow                   // conn-wide (not stream-specific) outbound flow control
	inflow           http2flow                   // conn-wide inbound flow control
	tlsState         *tls.ConnectionState        // shared by all handlers, like net/http
	remoteAddrStr    string
	writeSched       http2WriteScheduler

	// Everything following is owned by the serve loop; use serveG.check():
	serveG                      http2goroutineLock // used to verify funcs are on serve()
	pushEnabled                 bool
	sawFirstSettings            bool // got the initial SETTINGS frame after the preface
	needToSendSettingsAck       bool
	unackedSettings             int    // how many SETTINGS have we sent without ACKs?
	queuedControlFrames         int    // control frames in the writeSched queue
	clientMaxStreams            uint32 // SETTINGS_MAX_CONCURRENT_STREAMS from client (our PUSH_PROMISE limit)
	advMaxStreams               uint32 // our SETTINGS_MAX_CONCURRENT_STREAMS advertised the client
	curClientStreams            uint32 // number of open streams initiated by the client
	curPushedStreams            uint32 // number of open streams initiated by server push
	maxClientStreamID           uint32 // max ever seen from client (odd), or 0 if there have been no client requests
	maxPushPromiseID            uint32 // ID of the last push promise (even), or 0 if there have been no pushes
	streams                     map[uint32]*http2stream
	initialStreamSendWindowSize int32
	maxFrameSize                int32
	headerTableSize             uint32
	peerMaxHeaderListSize       uint32            // zero means unknown (default)
	canonHeader                 map[string]string // http2-lower-case -> Go-Canonical-Case
	writingFrame                bool              // started writing a frame (on serve goroutine or separate)
	writingFrameAsync           bool              // started a frame on its own goroutine but haven't heard back on wroteFrameCh
	needsFrameFlush             bool              // last frame write wasn't a flush
	inGoAway                    bool              // we've started to or sent GOAWAY
	inFrameScheduleLoop         bool              // whether we're in the scheduleFrameWrite loop
	needToSendGoAway            bool              // we need to schedule a GOAWAY frame write
	goAwayCode                  http2ErrCode
	shutdownTimer               *time.Timer // nil until used
	idleTimer                   *time.Timer // nil if unused

	// Owned by the writeFrameAsync goroutine:
	headerWriteBuf bytes.Buffer
	hpackEncoder   *hpack.Encoder

	// Used by startGracefulShutdown.
	shutdownOnce sync.Once
}

func (sc *http2serverConn) maxHeaderListSize() uint32 {
	n := sc.hs.MaxHeaderBytes
	if n <= 0 {
		n = DefaultMaxHeaderBytes
	}
	// http2's count is in a slightly different unit and includes 32 bytes per pair.
	// So, take the net/http.Server value and pad it up a bit, assuming 10 headers.
	const perFieldOverhead = 32 // per http2 spec
	const typicalHeaders = 10   // conservative
	return uint32(n + typicalHeaders*perFieldOverhead)
}

func (sc *http2serverConn) curOpenStreams() uint32 {
	sc.serveG.check()
	return sc.curClientStreams + sc.curPushedStreams
}

// stream represents a stream. This is the minimal metadata needed by
// the serve goroutine. Most of the actual stream state is owned by
// the http.Handler's goroutine in the responseWriter. Because the
// responseWriter's responseWriterState is recycled at the end of a
// handler, this struct intentionally has no pointer to the
// *responseWriter{,State} itself, as the Handler ending nils out the
// responseWriter's state field.
type http2stream struct {
	// immutable:
	sc        *http2serverConn
	id        uint32
	body      *http2pipe       // non-nil if expecting DATA frames
	cw        http2closeWaiter // closed wait stream transitions to closed state
	ctx       context.Context
	cancelCtx func()

	// owned by serverConn's serve loop:
	bodyBytes        int64     // body bytes seen so far
	declBodyBytes    int64     // or -1 if undeclared
	flow             http2flow // limits writing from Handler to client
	inflow           http2flow // what the client is allowed to POST/etc to us
	state            http2streamState
	resetQueued      bool        // RST_STREAM queued for write; set by sc.resetStream
	gotTrailerHeader bool        // HEADER frame for trailers was seen
	wroteHeaders     bool        // whether we wrote headers (not status 100)
	writeDeadline    *time.Timer // nil if unused

	trailer    Header // accumulated trailers
	reqTrailer Header // handler's Request.Trailer
}

func (sc *http2serverConn) Framer() *http2Framer { return sc.framer }

func (sc *http2serverConn) CloseConn() error { return sc.conn.Close() }

func (sc *http2serverConn) Flush() error { return sc.bw.Flush() }

func (sc *http2serverConn) HeaderEncoder() (*hpack.Encoder, *bytes.Buffer) {
	return sc.hpackEncoder, &sc.headerWriteBuf
}

func (sc *http2serverConn) state(streamID uint32) (http2streamState, *http2stream) {
	sc.serveG.check()
	// http://tools.ietf.org/html/rfc7540#section-5.1
	if st, ok := sc.streams[streamID]; ok {
		return st.state, st
	}
	// "The first use of a new stream identifier implicitly closes all
	// streams in the "idle" state that might have been initiated by
	// that peer with a lower-valued stream identifier. For example, if
	// a client sends a HEADERS frame on stream 7 without ever sending a
	// frame on stream 5, then stream 5 transitions to the "closed"
	// state when the first frame for stream 7 is sent or received."
	if streamID%2 == 1 {
		if streamID <= sc.maxClientStreamID {
			return http2stateClosed, nil
		}
	} else {
		if streamID <= sc.maxPushPromiseID {
			return http2stateClosed, nil
		}
	}
	return http2stateIdle, nil
}

// setConnState calls the net/http ConnState hook for this connection, if configured.
// Note that the net/http package does StateNew and StateClosed for us.
// There is currently no plan for StateHijacked or hijacking HTTP/2 connections.
func (sc *http2serverConn) setConnState(state ConnState) {
	if sc.hs.ConnState != nil {
		sc.hs.ConnState(sc.conn, state)
	}
}

func (sc *http2serverConn) vlogf(format string, args ...interface{}) {
	if http2VerboseLogs {
		sc.logf(format, args...)
	}
}

func (sc *http2serverConn) logf(format string, args ...interface{}) {
	if lg := sc.hs.ErrorLog; lg != nil {
		lg.Printf(format, args...)
	} else {
		log.Printf(format, args...)
	}
}

// errno returns v's underlying uintptr, else 0.
//
// TODO: remove this helper function once http2 can use build
// tags. See comment in isClosedConnError.
func http2errno(v error) uintptr {
	if rv := reflect.ValueOf(v); rv.Kind() == reflect.Uintptr {
		return uintptr(rv.Uint())
	}
	return 0
}

// isClosedConnError reports whether err is an error from use of a closed
// network connection.
func http2isClosedConnError(err error) bool {
	if err == nil {
		return false
	}

	// TODO: remove this string search and be more like the Windows
	// case below. That might involve modifying the standard library
	// to return better error types.
	str := err.Error()
	if strings.Contains(str, "use of closed network connection") {
		return true
	}

	// TODO(bradfitz): x/tools/cmd/bundle doesn't really support
	// build tags, so I can't make an http2_windows.go file with
	// Windows-specific stuff. Fix that and move this, once we
	// have a way to bundle this into std's net/http somehow.
	if runtime.GOOS == "windows" {
		if oe, ok := err.(*net.OpError); ok && oe.Op == "read" {
			if se, ok := oe.Err.(*os.SyscallError); ok && se.Syscall == "wsarecv" {
				const WSAECONNABORTED = 10053
				const WSAECONNRESET = 10054
				if n := http2errno(se.Err); n == WSAECONNRESET || n == WSAECONNABORTED {
					return true
				}
			}
		}
	}
	return false
}

func (sc *http2serverConn) condlogf(err error, format string, args ...interface{}) {
	if err == nil {
		return
	}
	if err == io.EOF || err == io.ErrUnexpectedEOF || http2isClosedConnError(err) || err == http2errPrefaceTimeout {
		// Boring, expected errors.
		sc.vlogf(format, args...)
	} else {
		sc.logf(format, args...)
	}
}

func (sc *http2serverConn) canonicalHeader(v string) string {
	sc.serveG.check()
	http2buildCommonHeaderMapsOnce()
	cv, ok := http2commonCanonHeader[v]
	if ok {
		return cv
	}
	cv, ok = sc.canonHeader[v]
	if ok {
		return cv
	}
	if sc.canonHeader == nil {
		sc.canonHeader = make(map[string]string)
	}
	cv = CanonicalHeaderKey(v)
	sc.canonHeader[v] = cv
	return cv
}

type http2readFrameResult struct {
	f   http2Frame // valid until readMore is called
	err error

	// readMore should be called once the consumer no longer needs or
	// retains f. After readMore, f is invalid and more frames can be
	// read.
	readMore func()
}

// readFrames is the loop that reads incoming frames.
// It takes care to only read one frame at a time, blocking until the
// consumer is done with the frame.
// It's run on its own goroutine.
func (sc *http2serverConn) readFrames() {
	gate := make(http2gate)
	gateDone := gate.Done
	for {
		f, err := sc.framer.ReadFrame()
		select {
		case sc.readFrameCh <- http2readFrameResult{f, err, gateDone}:
		case <-sc.doneServing:
			return
		}
		select {
		case <-gate:
		case <-sc.doneServing:
			return
		}
		if http2terminalReadFrameError(err) {
			return
		}
	}
}

// frameWriteResult is the message passed from writeFrameAsync to the serve goroutine.
type http2frameWriteResult struct {
	_   http2incomparable
	wr  http2FrameWriteRequest // what was written (or attempted)
	err error                  // result of the writeFrame call
}

// writeFrameAsync runs in its own goroutine and writes a single frame
// and then reports when it's done.
// At most one goroutine can be running writeFrameAsync at a time per
// serverConn.
func (sc *http2serverConn) writeFrameAsync(wr http2FrameWriteRequest) {
	err := wr.write.writeFrame(sc)
	sc.wroteFrameCh <- http2frameWriteResult{wr: wr, err: err}
}

func (sc *http2serverConn) closeAllStreamsOnConnClose() {
	sc.serveG.check()
	for _, st := range sc.streams {
		sc.closeStream(st, http2errClientDisconnected)
	}
}

func (sc *http2serverConn) stopShutdownTimer() {
	sc.serveG.check()
	if t := sc.shutdownTimer; t != nil {
		t.Stop()
	}
}

func (sc *http2serverConn) notePanic() {
	// Note: this is for serverConn.serve panicking, not http.Handler code.
	if http2testHookOnPanicMu != nil {
		http2testHookOnPanicMu.Lock()
		defer http2testHookOnPanicMu.Unlock()
	}
	if http2testHookOnPanic != nil {
		if e := recover(); e != nil {
			if http2testHookOnPanic(sc, e) {
				panic(e)
			}
		}
	}
}

func (sc *http2serverConn) serve() {
	sc.serveG.check()
	defer sc.notePanic()
	defer sc.conn.Close()
	defer sc.closeAllStreamsOnConnClose()
	defer sc.stopShutdownTimer()
	defer close(sc.doneServing) // unblocks handlers trying to send

	if http2VerboseLogs {
		sc.vlogf("http2: server connection from %v on %p", sc.conn.RemoteAddr(), sc.hs)
	}

	sc.writeFrame(http2FrameWriteRequest{
		write: http2writeSettings{
			{http2SettingMaxFrameSize, sc.srv.maxReadFrameSize()},
			{http2SettingMaxConcurrentStreams, sc.advMaxStreams},
			{http2SettingMaxHeaderListSize, sc.maxHeaderListSize()},
			{http2SettingInitialWindowSize, uint32(sc.srv.initialStreamRecvWindowSize())},
		},
	})
	sc.unackedSettings++

	// Each connection starts with intialWindowSize inflow tokens.
	// If a higher value is configured, we add more tokens.
	if diff := sc.srv.initialConnRecvWindowSize() - http2initialWindowSize; diff > 0 {
		sc.sendWindowUpdate(nil, int(diff))
	}

	if err := sc.readPreface(); err != nil {
		sc.condlogf(err, "http2: server: error reading preface from client %v: %v", sc.conn.RemoteAddr(), err)
		return
	}
	// Now that we've got the preface, get us out of the
	// "StateNew" state. We can't go directly to idle, though.
	// Active means we read some data and anticipate a request. We'll
	// do another Active when we get a HEADERS frame.
	sc.setConnState(StateActive)
	sc.setConnState(StateIdle)

	if sc.srv.IdleTimeout != 0 {
		sc.idleTimer = time.AfterFunc(sc.srv.IdleTimeout, sc.onIdleTimer)
		defer sc.idleTimer.Stop()
	}

	go sc.readFrames() // closed by defer sc.conn.Close above

	settingsTimer := time.AfterFunc(http2firstSettingsTimeout, sc.onSettingsTimer)
	defer settingsTimer.Stop()

	loopNum := 0
	for {
		loopNum++
		select {
		case wr := <-sc.wantWriteFrameCh:
			if se, ok := wr.write.(http2StreamError); ok {
				sc.resetStream(se)
				break
			}
			sc.writeFrame(wr)
		case res := <-sc.wroteFrameCh:
			sc.wroteFrame(res)
		case res := <-sc.readFrameCh:
			if !sc.processFrameFromReader(res) {
				return
			}
			res.readMore()
			if settingsTimer != nil {
				settingsTimer.Stop()
				settingsTimer = nil
			}
		case m := <-sc.bodyReadCh:
			sc.noteBodyRead(m.st, m.n)
		case msg := <-sc.serveMsgCh:
			switch v := msg.(type) {
			case func(int):
				v(loopNum) // for testing
			case *http2serverMessage:
				switch v {
				case http2settingsTimerMsg:
					sc.logf("timeout waiting for SETTINGS frames from %v", sc.conn.RemoteAddr())
					return
				case http2idleTimerMsg:
					sc.vlogf("connection is idle")
					sc.goAway(http2ErrCodeNo)
				case http2shutdownTimerMsg:
					sc.vlogf("GOAWAY close timer fired; closing conn from %v", sc.conn.RemoteAddr())
					return
				case http2gracefulShutdownMsg:
					sc.startGracefulShutdownInternal()
				default:
					panic("unknown timer")
				}
			case *http2startPushRequest:
				sc.startPush(v)
			default:
				panic(fmt.Sprintf("unexpected type %T", v))
			}
		}

		// If the peer is causing us to generate a lot of control frames,
		// but not reading them from us, assume they are trying to make us
		// run out of memory.
		if sc.queuedControlFrames > sc.srv.maxQueuedControlFrames() {
			sc.vlogf("http2: too many control frames in send queue, closing connection")
			return
		}

		// Start the shutdown timer after sending a GOAWAY. When sending GOAWAY
		// with no error code (graceful shutdown), don't start the timer until
		// all open streams have been completed.
		sentGoAway := sc.inGoAway && !sc.needToSendGoAway && !sc.writingFrame
		gracefulShutdownComplete := sc.goAwayCode == http2ErrCodeNo && sc.curOpenStreams() == 0
		if sentGoAway && sc.shutdownTimer == nil && (sc.goAwayCode != http2ErrCodeNo || gracefulShutdownComplete) {
			sc.shutDownIn(http2goAwayTimeout)
		}
	}
}

func (sc *http2serverConn) awaitGracefulShutdown(sharedCh <-chan struct{}, privateCh chan struct{}) {
	select {
	case <-sc.doneServing:
	case <-sharedCh:
		close(privateCh)
	}
}

type http2serverMessage int

// Message values sent to serveMsgCh.
var (
	http2settingsTimerMsg    = new(http2serverMessage)
	http2idleTimerMsg        = new(http2serverMessage)
	http2shutdownTimerMsg    = new(http2serverMessage)
	http2gracefulShutdownMsg = new(http2serverMessage)
)

func (sc *http2serverConn) onSettingsTimer() { sc.sendServeMsg(http2settingsTimerMsg) }

func (sc *http2serverConn) onIdleTimer() { sc.sendServeMsg(http2idleTimerMsg) }

func (sc *http2serverConn) onShutdownTimer() { sc.sendServeMsg(http2shutdownTimerMsg) }

func (sc *http2serverConn) sendServeMsg(msg interface{}) {
	sc.serveG.checkNotOn() // NOT
	select {
	case sc.serveMsgCh <- msg:
	case <-sc.doneServing:
	}
}

var http2errPrefaceTimeout = errors.New("timeout waiting for client preface")

// readPreface reads the ClientPreface greeting from the peer or
// returns errPrefaceTimeout on timeout, or an error if the greeting
// is invalid.
func (sc *http2serverConn) readPreface() error {
	errc := make(chan error, 1)
	go func() {
		// Read the client preface
		buf := make([]byte, len(http2ClientPreface))
		if _, err := io.ReadFull(sc.conn, buf); err != nil {
			errc <- err
		} else if !bytes.Equal(buf, http2clientPreface) {
			errc <- fmt.Errorf("bogus greeting %q", buf)
		} else {
			errc <- nil
		}
	}()
	timer := time.NewTimer(http2prefaceTimeout) // TODO: configurable on *Server?
	defer timer.Stop()
	select {
	case <-timer.C:
		return http2errPrefaceTimeout
	case err := <-errc:
		if err == nil {
			if http2VerboseLogs {
				sc.vlogf("http2: server: client %v said hello", sc.conn.RemoteAddr())
			}
		}
		return err
	}
}

var http2errChanPool = sync.Pool{
	New: func() interface{} { return make(chan error, 1) },
}

var http2writeDataPool = sync.Pool{
	New: func() interface{} { return new(http2writeData) },
}

// writeDataFromHandler writes DATA response frames from a handler on
// the given stream.
func (sc *http2serverConn) writeDataFromHandler(stream *http2stream, data []byte, endStream bool) error {
	ch := http2errChanPool.Get().(chan error)
	writeArg := http2writeDataPool.Get().(*http2writeData)
	*writeArg = http2writeData{stream.id, data, endStream}
	err := sc.writeFrameFromHandler(http2FrameWriteRequest{
		write:  writeArg,
		stream: stream,
		done:   ch,
	})
	if err != nil {
		return err
	}
	var frameWriteDone bool // the frame write is done (successfully or not)
	select {
	case err = <-ch:
		frameWriteDone = true
	case <-sc.doneServing:
		return http2errClientDisconnected
	case <-stream.cw:
		// If both ch and stream.cw were ready (as might
		// happen on the final Write after an http.Handler
		// ends), prefer the write result. Otherwise this
		// might just be us successfully closing the stream.
		// The writeFrameAsync and serve goroutines guarantee
		// that the ch send will happen before the stream.cw
		// close.
		select {
		case err = <-ch:
			frameWriteDone = true
		default:
			return http2errStreamClosed
		}
	}
	http2errChanPool.Put(ch)
	if frameWriteDone {
		http2writeDataPool.Put(writeArg)
	}
	return err
}

// writeFrameFromHandler sends wr to sc.wantWriteFrameCh, but aborts
// if the connection has gone away.
//
// This must not be run from the serve goroutine itself, else it might
// deadlock writing to sc.wantWriteFrameCh (which is only mildly
// buffered and is read by serve itself). If you're on the serve
// goroutine, call writeFrame instead.
func (sc *http2serverConn) writeFrameFromHandler(wr http2FrameWriteRequest) error {
	sc.serveG.checkNotOn() // NOT
	select {
	case sc.wantWriteFrameCh <- wr:
		return nil
	case <-sc.doneServing:
		// Serve loop is gone.
		// Client has closed their connection to the server.
		return http2errClientDisconnected
	}
}

// writeFrame schedules a frame to write and sends it if there's nothing
// already being written.
//
// There is no pushback here (the serve goroutine never blocks). It's
// the http.Handlers that block, waiting for their previous frames to
// make it onto the wire
//
// If you're not on the serve goroutine, use writeFrameFromHandler instead.
func (sc *http2serverConn) writeFrame(wr http2FrameWriteRequest) {
	sc.serveG.check()

	// If true, wr will not be written and wr.done will not be signaled.
	var ignoreWrite bool

	// We are not allowed to write frames on closed streams. RFC 7540 Section
	// 5.1.1 says: "An endpoint MUST NOT send frames other than PRIORITY on
	// a closed stream." Our server never sends PRIORITY, so that exception
	// does not apply.
	//
	// The serverConn might close an open stream while the stream's handler
	// is still running. For example, the server might close a stream when it
	// receives bad data from the client. If this happens, the handler might
	// attempt to write a frame after the stream has been closed (since the
	// handler hasn't yet been notified of the close). In this case, we simply
	// ignore the frame. The handler will notice that the stream is closed when
	// it waits for the frame to be written.
	//
	// As an exception to this rule, we allow sending RST_STREAM after close.
	// This allows us to immediately reject new streams without tracking any
	// state for those streams (except for the queued RST_STREAM frame). This
	// may result in duplicate RST_STREAMs in some cases, but the client should
	// ignore those.
	if wr.StreamID() != 0 {
		_, isReset := wr.write.(http2StreamError)
		if state, _ := sc.state(wr.StreamID()); state == http2stateClosed && !isReset {
			ignoreWrite = true
		}
	}

	// Don't send a 100-continue response if we've already sent headers.
	// See golang.org/issue/14030.
	switch wr.write.(type) {
	case *http2writeResHeaders:
		wr.stream.wroteHeaders = true
	case http2write100ContinueHeadersFrame:
		if wr.stream.wroteHeaders {
			// We do not need to notify wr.done because this frame is
			// never written with wr.done != nil.
			if wr.done != nil {
				panic("wr.done != nil for write100ContinueHeadersFrame")
			}
			ignoreWrite = true
		}
	}

	if !ignoreWrite {
		if wr.isControl() {
			sc.queuedControlFrames++
			// For extra safety, detect wraparounds, which should not happen,
			// and pull the plug.
			if sc.queuedControlFrames < 0 {
				sc.conn.Close()
			}
		}
		sc.writeSched.Push(wr)
	}
	sc.scheduleFrameWrite()
}

// startFrameWrite starts a goroutine to write wr (in a separate
// goroutine since that might block on the network), and updates the
// serve goroutine's state about the world, updated from info in wr.
func (sc *http2serverConn) startFrameWrite(wr http2FrameWriteRequest) {
	sc.serveG.check()
	if sc.writingFrame {
		panic("internal error: can only be writing one frame at a time")
	}

	st := wr.stream
	if st != nil {
		switch st.state {
		case http2stateHalfClosedLocal:
			switch wr.write.(type) {
			case http2StreamError, http2handlerPanicRST, http2writeWindowUpdate:
				// RFC 7540 Section 5.1 allows sending RST_STREAM, PRIORITY, and WINDOW_UPDATE
				// in this state. (We never send PRIORITY from the server, so that is not checked.)
			default:
				panic(fmt.Sprintf("internal error: attempt to send frame on a half-closed-local stream: %v", wr))
			}
		case http2stateClosed:
			panic(fmt.Sprintf("internal error: attempt to send frame on a closed stream: %v", wr))
		}
	}
	if wpp, ok := wr.write.(*http2writePushPromise); ok {
		var err error
		wpp.promisedID, err = wpp.allocatePromisedID()
		if err != nil {
			sc.writingFrameAsync = false
			wr.replyToWriter(err)
			return
		}
	}

	sc.writingFrame = true
	sc.needsFrameFlush = true
	if wr.write.staysWithinBuffer(sc.bw.Available()) {
		sc.writingFrameAsync = false
		err := wr.write.writeFrame(sc)
		sc.wroteFrame(http2frameWriteResult{wr: wr, err: err})
	} else {
		sc.writingFrameAsync = true
		go sc.writeFrameAsync(wr)
	}
}

// errHandlerPanicked is the error given to any callers blocked in a read from
// Request.Body when the main goroutine panics. Since most handlers read in the
// main ServeHTTP goroutine, this will show up rarely.
var http2errHandlerPanicked = errors.New("http2: handler panicked")

// wroteFrame is called on the serve goroutine with the result of
// whatever happened on writeFrameAsync.
func (sc *http2serverConn) wroteFrame(res http2frameWriteResult) {
	sc.serveG.check()
	if !sc.writingFrame {
		panic("internal error: expected to be already writing a frame")
	}
	sc.writingFrame = false
	sc.writingFrameAsync = false

	wr := res.wr

	if http2writeEndsStream(wr.write) {
		st := wr.stream
		if st == nil {
			panic("internal error: expecting non-nil stream")
		}
		switch st.state {
		case http2stateOpen:
			// Here we would go to stateHalfClosedLocal in
			// theory, but since our handler is done and
			// the net/http package provides no mechanism
			// for closing a ResponseWriter while still
			// reading data (see possible TODO at top of
			// this file), we go into closed state here
			// anyway, after telling the peer we're
			// hanging up on them. We'll transition to
			// stateClosed after the RST_STREAM frame is
			// written.
			st.state = http2stateHalfClosedLocal
			// Section 8.1: a server MAY request that the client abort
			// transmission of a request without error by sending a
			// RST_STREAM with an error code of NO_ERROR after sending
			// a complete response.
			sc.resetStream(http2streamError(st.id, http2ErrCodeNo))
		case http2stateHalfClosedRemote:
			sc.closeStream(st, http2errHandlerComplete)
		}
	} else {
		switch v := wr.write.(type) {
		case http2StreamError:
			// st may be unknown if the RST_STREAM was generated to reject bad input.
			if st, ok := sc.streams[v.StreamID]; ok {
				sc.closeStream(st, v)
			}
		case http2handlerPanicRST:
			sc.closeStream(wr.stream, http2errHandlerPanicked)
		}
	}

	// Reply (if requested) to unblock the ServeHTTP goroutine.
	wr.replyToWriter(res.err)

	sc.scheduleFrameWrite()
}

// scheduleFrameWrite tickles the frame writing scheduler.
//
// If a frame is already being written, nothing happens. This will be called again
// when the frame is done being written.
//
// If a frame isn't being written and we need to send one, the best frame
// to send is selected by writeSched.
//
// If a frame isn't being written and there's nothing else to send, we
// flush the write buffer.
func (sc *http2serverConn) scheduleFrameWrite() {
	sc.serveG.check()
	if sc.writingFrame || sc.inFrameScheduleLoop {
		return
	}
	sc.inFrameScheduleLoop = true
	for !sc.writingFrameAsync {
		if sc.needToSendGoAway {
			sc.needToSendGoAway = false
			sc.startFrameWrite(http2FrameWriteRequest{
				write: &http2writeGoAway{
					maxStreamID: sc.maxClientStreamID,
					code:        sc.goAwayCode,
				},
			})
			continue
		}
		if sc.needToSendSettingsAck {
			sc.needToSendSettingsAck = false
			sc.startFrameWrite(http2FrameWriteRequest{write: http2writeSettingsAck{}})
			continue
		}
		if !sc.inGoAway || sc.goAwayCode == http2ErrCodeNo {
			if wr, ok := sc.writeSched.Pop(); ok {
				if wr.isControl() {
					sc.queuedControlFrames--
				}
				sc.startFrameWrite(wr)
				continue
			}
		}
		if sc.needsFrameFlush {
			sc.startFrameWrite(http2FrameWriteRequest{write: http2flushFrameWriter{}})
			sc.needsFrameFlush = false // after startFrameWrite, since it sets this true
			continue
		}
		break
	}
	sc.inFrameScheduleLoop = false
}

// startGracefulShutdown gracefully shuts down a connection. This
// sends GOAWAY with ErrCodeNo to tell the client we're gracefully
// shutting down. The connection isn't closed until all current
// streams are done.
//
// startGracefulShutdown returns immediately; it does not wait until
// the connection has shut down.
func (sc *http2serverConn) startGracefulShutdown() {
	sc.serveG.checkNotOn() // NOT
	sc.shutdownOnce.Do(func() { sc.sendServeMsg(http2gracefulShutdownMsg) })
}

// After sending GOAWAY, the connection will close after goAwayTimeout.
// If we close the connection immediately after sending GOAWAY, there may
// be unsent d