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conn.go
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conn.go
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package requests
import (
"context"
"crypto/tls"
"github.com/quic-go/quic-go/http3"
utls "github.com/refraction-networking/utls"
"golang.org/x/net/http2"
"net"
"net/http"
"net/url"
"strings"
)
type Conn interface {
RoundTrip(r *http.Request) (resp *http.Response, err error)
}
type conn struct {
transport http.RoundTripper
}
type ConnConfig struct {
Proxy string
DisableH2 bool
EnableH3 bool
}
func NewConn(config ...ConnConfig) Conn {
if len(config) == 0 {
return newH2Conn()
}
if config[0].Proxy != "" || config[0].DisableH2 {
return newH1Conn(config[0].Proxy)
}
if config[0].EnableH3 {
return newH3Conn()
}
return newH2Conn()
}
func newH1Conn(proxy string) Conn {
transport := &http.Transport{
DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
c, err := net.Dial(network, addr)
if err != nil {
return nil, err
}
uconn := utls.UClient(c, nil, utls.HelloRandomizedNoALPN)
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
uconn.SetSNI(addr[:colonPos])
err = uconn.Handshake()
return uconn, err
},
MaxIdleConnsPerHost: 128,
MaxIdleConns: 128,
MaxConnsPerHost: 128,
ForceAttemptHTTP2: false,
TLSNextProto: make(map[string]func(authority string, c *tls.Conn) http.RoundTripper),
}
if proxy != "" {
u, err := url.Parse(proxy)
if err != nil {
panic(err)
}
transport.Proxy = http.ProxyURL(u)
}
return &conn{
transport: transport,
}
}
func newH2Conn() Conn {
transport := &http2.Transport{
DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
c, err := net.Dial(network, addr)
if err != nil {
return nil, err
}
uconn := utls.UClient(c, &utls.Config{NextProtos: cfg.NextProtos}, utls.HelloRandomized)
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
uconn.SetSNI(addr[:colonPos])
err = uconn.Handshake()
return uconn, err
},
MaxHeaderListSize: 0xffffffff,
MaxReadFrameSize: 0x01000000,
MaxDecoderHeaderTableSize: 0x00001000,
MaxEncoderHeaderTableSize: 0x00001000,
StrictMaxConcurrentStreams: true,
}
return &conn{
transport: transport,
}
}
func newH3Conn() Conn {
return &conn{
transport: &http3.RoundTripper{},
}
}
func (c *conn) RoundTrip(r *http.Request) (resp *http.Response, err error) {
return c.transport.RoundTrip(r)
}