transport: add httpupgrade

infra/conf/transport.go

@@ -7,14 +7,15 @@ import (
 )
 
 type TransportConfig struct {
-	TCPConfig  *TCPConfig          `json:"tcpSettings"`
+	TCPConfig         *TCPConfig          `json:"tcpSettings"`
-	KCPConfig  *KCPConfig          `json:"kcpSettings"`
+	KCPConfig         *KCPConfig          `json:"kcpSettings"`
-	WSConfig   *WebSocketConfig    `json:"wsSettings"`
+	WSConfig          *WebSocketConfig    `json:"wsSettings"`
-	HTTPConfig *HTTPConfig         `json:"httpSettings"`
+	HTTPConfig        *HTTPConfig         `json:"httpSettings"`
-	DSConfig   *DomainSocketConfig `json:"dsSettings"`
+	DSConfig          *DomainSocketConfig `json:"dsSettings"`
-	QUICConfig *QUICConfig         `json:"quicSettings"`
+	QUICConfig        *QUICConfig         `json:"quicSettings"`
-	GRPCConfig *GRPCConfig         `json:"grpcSettings"`
+	GRPCConfig        *GRPCConfig         `json:"grpcSettings"`
-	GUNConfig  *GRPCConfig         `json:"gunSettings"`
+	GUNConfig         *GRPCConfig         `json:"gunSettings"`
+	HTTPUPGRADEConfig *HttpUpgradeConfig  `json:"httpupgradeSettings"`
 }
 
 // Build implements Buildable.
@@ -101,5 +102,16 @@ func (c *TransportConfig) Build() (*global.Config, error) {
 		})
 	}
 
+	if c.HTTPUPGRADEConfig != nil {
+		hs, err := c.HTTPUPGRADEConfig.Build()
+		if err != nil {
+			return nil, newError("failed to build HttpUpgrade config").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "httpupgrade",
+			Settings:     serial.ToTypedMessage(hs),
+		})
+	}
+
 	return config, nil
 }

infra/conf/transport_internet.go

@@ -19,6 +19,7 @@ import (
 	"github.com/xtls/xray-core/transport/internet/domainsocket"
 	httpheader "github.com/xtls/xray-core/transport/internet/headers/http"
 	"github.com/xtls/xray-core/transport/internet/http"
+	"github.com/xtls/xray-core/transport/internet/httpupgrade"
 	"github.com/xtls/xray-core/transport/internet/kcp"
 	"github.com/xtls/xray-core/transport/internet/quic"
 	"github.com/xtls/xray-core/transport/internet/reality"
@@ -181,6 +182,24 @@ func (c *WebSocketConfig) Build() (proto.Message, error) {
 	return config, nil
 }
 
+type HttpUpgradeConfig struct {
+	Path                string `json:"path"`
+	Host                string `json:"host"`
+	AcceptProxyProtocol bool   `json:"acceptProxyProtocol"`
+}
+
+// Build implements Buildable.
+func (c *HttpUpgradeConfig) Build() (proto.Message, error) {
+	config := &httpupgrade.Config{
+		Path: c.Path,
+		Host: c.Host,
+	}
+	if c.AcceptProxyProtocol {
+		config.AcceptProxyProtocol = c.AcceptProxyProtocol
+	}
+	return config, nil
+}
+
 type HTTPConfig struct {
 	Host               *StringList            `json:"host"`
 	Path               string                 `json:"path"`
@@ -606,6 +625,8 @@ func (p TransportProtocol) Build() (string, error) {
 		return "quic", nil
 	case "grpc", "gun":
 		return "grpc", nil
+	case "httpupgrade":
+		return "httpupgrade", nil
 	default:
 		return "", newError("Config: unknown transport protocol: ", p)
 	}
@@ -706,19 +727,20 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 }
 
 type StreamConfig struct {
-	Network         *TransportProtocol  `json:"network"`
+	Network             *TransportProtocol  `json:"network"`
-	Security        string              `json:"security"`
+	Security            string              `json:"security"`
-	TLSSettings     *TLSConfig          `json:"tlsSettings"`
+	TLSSettings         *TLSConfig          `json:"tlsSettings"`
-	REALITYSettings *REALITYConfig      `json:"realitySettings"`
+	REALITYSettings     *REALITYConfig      `json:"realitySettings"`
-	TCPSettings     *TCPConfig          `json:"tcpSettings"`
+	TCPSettings         *TCPConfig          `json:"tcpSettings"`
-	KCPSettings     *KCPConfig          `json:"kcpSettings"`
+	KCPSettings         *KCPConfig          `json:"kcpSettings"`
-	WSSettings      *WebSocketConfig    `json:"wsSettings"`
+	WSSettings          *WebSocketConfig    `json:"wsSettings"`
-	HTTPSettings    *HTTPConfig         `json:"httpSettings"`
+	HTTPSettings        *HTTPConfig         `json:"httpSettings"`
-	DSSettings      *DomainSocketConfig `json:"dsSettings"`
+	DSSettings          *DomainSocketConfig `json:"dsSettings"`
-	QUICSettings    *QUICConfig         `json:"quicSettings"`
+	QUICSettings        *QUICConfig         `json:"quicSettings"`
-	SocketSettings  *SocketConfig       `json:"sockopt"`
+	SocketSettings      *SocketConfig       `json:"sockopt"`
-	GRPCConfig      *GRPCConfig         `json:"grpcSettings"`
+	GRPCConfig          *GRPCConfig         `json:"grpcSettings"`
-	GUNConfig       *GRPCConfig         `json:"gunSettings"`
+	GUNConfig           *GRPCConfig         `json:"gunSettings"`
+	HTTPUPGRADESettings *HttpUpgradeConfig  `json:"httpupgradeSettings"`
 }
 
 // Build implements Buildable.
@@ -839,6 +861,16 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			Settings:     serial.ToTypedMessage(gs),
 		})
 	}
+	if c.HTTPUPGRADESettings != nil {
+		hs, err := c.HTTPUPGRADESettings.Build()
+		if err != nil {
+			return nil, newError("Failed to build HttpUpgrade config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "httpupgrade",
+			Settings:     serial.ToTypedMessage(hs),
+		})
+	}
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {

infra/conf/xray.go

@@ -544,6 +544,9 @@ func applyTransportConfig(s *StreamConfig, t *TransportConfig) {
 	if s.DSSettings == nil {
 		s.DSSettings = t.DSConfig
 	}
+	if s.HTTPUPGRADESettings == nil {
+		s.HTTPUPGRADESettings = t.HTTPUPGRADEConfig
+	}
 }
 
 // Build implements Buildable.

main/distro/all/all.go

@@ -53,6 +53,7 @@ import (
 	_ "github.com/xtls/xray-core/transport/internet/domainsocket"
 	_ "github.com/xtls/xray-core/transport/internet/grpc"
 	_ "github.com/xtls/xray-core/transport/internet/http"
+	_ "github.com/xtls/xray-core/transport/internet/httpupgrade"
 	_ "github.com/xtls/xray-core/transport/internet/kcp"
 	_ "github.com/xtls/xray-core/transport/internet/quic"
 	_ "github.com/xtls/xray-core/transport/internet/reality"

transport/internet/httpupgrade/config.go

@@ -0,0 +1,12 @@
+package httpupgrade
+
+func (c *Config) GetNormalizedPath() string {
+	path := c.Path
+	if path == "" {
+		return "/"
+	}
+	if path[0] != '/' {
+		return "/" + path
+	}
+	return path
+}

transport/internet/httpupgrade/config.pb.go

@@ -0,0 +1,174 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.32.0
+// 	protoc        v4.25.1
+// source: transport/internet/httpupgrade/config.proto
+
+package httpupgrade
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Path                string `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	Host                string `protobuf:"bytes,3,opt,name=host,proto3" json:"host,omitempty"`
+	AcceptProxyProtocol bool   `protobuf:"varint,4,opt,name=accept_proxy_protocol,json=acceptProxyProtocol,proto3" json:"accept_proxy_protocol,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_httpupgrade_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_httpupgrade_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_transport_internet_httpupgrade_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+func (x *Config) GetHost() string {
+	if x != nil {
+		return x.Host
+	}
+	return ""
+}
+
+func (x *Config) GetAcceptProxyProtocol() bool {
+	if x != nil {
+		return x.AcceptProxyProtocol
+	}
+	return false
+}
+
+var File_transport_internet_httpupgrade_config_proto protoreflect.FileDescriptor
+
+var file_transport_internet_httpupgrade_config_proto_rawDesc = []byte{
+	0x0a, 0x2b, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x68, 0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61, 0x64, 0x65,
+	0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x23, 0x78,
+	0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e,
+	0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x68, 0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61,
+	0x64, 0x65, 0x22, 0x6a, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04,
+	0x70, 0x61, 0x74, 0x68, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x70, 0x61, 0x74, 0x68,
+	0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
+	0x68, 0x6f, 0x73, 0x74, 0x12, 0x32, 0x0a, 0x15, 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x5f, 0x70,
+	0x72, 0x6f, 0x78, 0x79, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x18, 0x04, 0x20,
+	0x01, 0x28, 0x08, 0x52, 0x13, 0x61, 0x63, 0x63, 0x65, 0x70, 0x74, 0x50, 0x72, 0x6f, 0x78, 0x79,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x4a, 0x04, 0x08, 0x01, 0x10, 0x02, 0x42, 0x8b,
+	0x01, 0x0a, 0x27, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e,
+	0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x68,
+	0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61, 0x64, 0x65, 0x50, 0x01, 0x5a, 0x38, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72,
+	0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72,
+	0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2f, 0x68, 0x74, 0x74, 0x70, 0x75,
+	0x70, 0x67, 0x72, 0x61, 0x64, 0x65, 0xaa, 0x02, 0x23, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x54, 0x72,
+	0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74,
+	0x2e, 0x48, 0x74, 0x74, 0x70, 0x55, 0x70, 0x67, 0x72, 0x61, 0x64, 0x65, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_transport_internet_httpupgrade_config_proto_rawDescOnce sync.Once
+	file_transport_internet_httpupgrade_config_proto_rawDescData = file_transport_internet_httpupgrade_config_proto_rawDesc
+)
+
+func file_transport_internet_httpupgrade_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_httpupgrade_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_httpupgrade_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_httpupgrade_config_proto_rawDescData)
+	})
+	return file_transport_internet_httpupgrade_config_proto_rawDescData
+}
+
+var file_transport_internet_httpupgrade_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_httpupgrade_config_proto_goTypes = []interface{}{
+	(*Config)(nil), // 0: xray.transport.internet.httpupgrade.Config
+}
+var file_transport_internet_httpupgrade_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_httpupgrade_config_proto_init() }
+func file_transport_internet_httpupgrade_config_proto_init() {
+	if File_transport_internet_httpupgrade_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_transport_internet_httpupgrade_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_transport_internet_httpupgrade_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_httpupgrade_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_httpupgrade_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_httpupgrade_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_httpupgrade_config_proto = out.File
+	file_transport_internet_httpupgrade_config_proto_rawDesc = nil
+	file_transport_internet_httpupgrade_config_proto_goTypes = nil
+	file_transport_internet_httpupgrade_config_proto_depIdxs = nil
+}

transport/internet/httpupgrade/config.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package xray.transport.internet.httpupgrade;
+option csharp_namespace = "Xray.Transport.Internet.HttpUpgrade";
+option go_package = "github.com/xtls/xray-core/transport/internet/httpupgrade";
+option java_package = "com.xray.transport.internet.httpupgrade";
+option java_multiple_files = true;
+
+message Config {
+  reserved 1;
+
+  string path = 2;
+  string host = 3;
+
+  bool accept_proxy_protocol = 4;
+}

transport/internet/httpupgrade/dialer.go

@@ -0,0 +1,87 @@
+package httpupgrade
+
+import (
+	"bufio"
+	"context"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+func dialhttpUpgrade(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (net.Conn, error) {
+	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
+
+	pconn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
+	if err != nil {
+		newError("failed to dial to ", dest).Base(err).AtError().WriteToLog()
+		return nil, err
+	}
+
+	var conn net.Conn
+	var requestURL url.URL
+	if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
+		tlsConfig := config.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
+		if fingerprint := tls.GetFingerprint(config.Fingerprint); fingerprint != nil {
+			conn = tls.UClient(pconn, tlsConfig, fingerprint)
+			if err := conn.(*tls.UConn).WebsocketHandshakeContext(ctx); err != nil {
+				return nil, err
+			}
+		} else {
+			conn = tls.Client(pconn, tlsConfig)
+		}
+
+		requestURL.Scheme = "https"
+	} else {
+		requestURL.Scheme = "http"
+	}
+
+	requestURL.Host = dest.NetAddr()
+	requestURL.Path = transportConfiguration.GetNormalizedPath()
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL:    &requestURL,
+		Host:   transportConfiguration.Host,
+		Header: make(http.Header),
+	}
+	req.Header.Set("Connection", "upgrade")
+	req.Header.Set("Upgrade", "websocket")
+
+	err = req.Write(conn)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO The bufio usage here is unreliable
+	resp, err := http.ReadResponse(bufio.NewReader(conn), req) // nolint:bodyclose
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.Status == "101 Switching Protocols" &&
+		strings.ToLower(resp.Header.Get("Upgrade")) == "websocket" &&
+		strings.ToLower(resp.Header.Get("Connection")) == "upgrade" {
+		return conn, nil
+	}
+	return nil, newError("unrecognized reply")
+}
+
+func dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
+	newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
+
+	conn, err := dialhttpUpgrade(ctx, dest, streamSettings)
+	if err != nil {
+		return nil, newError("failed to dial request to ", dest).Base(err)
+	}
+	return stat.Connection(conn), nil
+}
+
+func init() {
+	common.Must(internet.RegisterTransportDialer(protocolName, dial))
+}

transport/internet/httpupgrade/errors.generated.go

@@ -0,0 +1,9 @@
+package httpupgrade
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

transport/internet/httpupgrade/httpupgrade.go

@@ -0,0 +1,17 @@
+package httpupgrade
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/common"
+)
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+const protocolName = "httpupgrade"
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return nil, newError("httpupgrade is a transport protocol.")
+	}))
+}

transport/internet/httpupgrade/hub.go

@@ -0,0 +1,140 @@
+package httpupgrade
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"net/http"
+	"strings"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	v2tls "github.com/xtls/xray-core/transport/internet/tls"
+)
+
+type server struct {
+	config         *Config
+	addConn        internet.ConnHandler
+	innnerListener net.Listener
+}
+
+func (s *server) Close() error {
+	return s.innnerListener.Close()
+}
+
+func (s *server) Addr() net.Addr {
+	return nil
+}
+
+func (s *server) Handle(conn net.Conn) (stat.Connection, error) {
+	connReader := bufio.NewReader(conn)
+	req, err := http.ReadRequest(connReader)
+	if err != nil {
+		return nil, err
+	}
+
+	if s.config != nil {
+		host := req.Host
+		if len(s.config.Host) > 0 && host != s.config.Host {
+			return nil, newError("bad host: ", host)
+		}
+		path := s.config.GetNormalizedPath()
+		if req.URL.Path != path {
+			return nil, newError("bad path: ", req.URL.Path)
+		}
+	}
+
+	connection := strings.ToLower(req.Header.Get("Connection"))
+	upgrade := strings.ToLower(req.Header.Get("Upgrade"))
+	if connection != "upgrade" || upgrade != "websocket" {
+		_ = conn.Close()
+		return nil, newError("unrecognized request")
+	}
+	resp := &http.Response{
+		Status:     "101 Switching Protocols",
+		StatusCode: 101,
+		Proto:      "HTTP/1.1",
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     http.Header{},
+	}
+	resp.Header.Set("Connection", "upgrade")
+	resp.Header.Set("Upgrade", "websocket")
+	err = resp.Write(conn)
+	if err != nil {
+		_ = conn.Close()
+		return nil, err
+	}
+	return stat.Connection(conn), nil
+}
+
+func (s *server) keepAccepting() {
+	for {
+		conn, err := s.innnerListener.Accept()
+		if err != nil {
+			return
+		}
+		handledConn, err := s.Handle(conn)
+		if err != nil {
+			newError("failed to handle request").Base(err).WriteToLog()
+			continue
+		}
+		s.addConn(handledConn)
+	}
+}
+
+func listenHTTPUpgrade(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) {
+	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
+	if transportConfiguration != nil {
+		if streamSettings.SocketSettings == nil {
+			streamSettings.SocketSettings = &internet.SocketConfig{}
+		}
+		streamSettings.SocketSettings.AcceptProxyProtocol = transportConfiguration.AcceptProxyProtocol || streamSettings.SocketSettings.AcceptProxyProtocol
+	}
+	var listener net.Listener
+	var err error
+	if port == net.Port(0) { // unix
+		listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
+			Name: address.Domain(),
+			Net:  "unix",
+		}, streamSettings.SocketSettings)
+		if err != nil {
+			return nil, newError("failed to listen unix domain socket(for HttpUpgrade) on ", address).Base(err)
+		}
+		newError("listening unix domain socket(for HttpUpgrade) on ", address).WriteToLog(session.ExportIDToError(ctx))
+	} else { // tcp
+		listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
+			IP:   address.IP(),
+			Port: int(port),
+		}, streamSettings.SocketSettings)
+		if err != nil {
+			return nil, newError("failed to listen TCP(for HttpUpgrade) on ", address, ":", port).Base(err)
+		}
+		newError("listening TCP(for HttpUpgrade) on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
+	}
+
+	if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
+		newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
+	}
+
+	if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil {
+		if tlsConfig := config.GetTLSConfig(); tlsConfig != nil {
+			listener = tls.NewListener(listener, tlsConfig)
+		}
+	}
+
+	serverInstance := &server{
+		config:         transportConfiguration,
+		addConn:        addConn,
+		innnerListener: listener,
+	}
+	go serverInstance.keepAccepting()
+	return serverInstance, nil
+}
+
+func init() {
+	common.Must(internet.RegisterTransportListener(protocolName, listenHTTPUpgrade))
+}