Add SplitHTTP Transport (#3412)

infra/conf/transport.go

@@ -16,6 +16,7 @@ type TransportConfig struct {
 	GRPCConfig        *GRPCConfig         `json:"grpcSettings"`
 	GUNConfig         *GRPCConfig         `json:"gunSettings"`
 	HTTPUPGRADEConfig *HttpUpgradeConfig  `json:"httpupgradeSettings"`
+	SplitHTTPConfig   *SplitHTTPConfig    `json:"splithttpSettings"`
 }
 
 // Build implements Buildable.
@@ -113,5 +114,16 @@ func (c *TransportConfig) Build() (*global.Config, error) {
 		})
 	}
 
+	if c.SplitHTTPConfig != nil {
+		shs, err := c.SplitHTTPConfig.Build()
+		if err != nil {
+			return nil, newError("failed to build SplitHTTP config").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "splithttp",
+			Settings:     serial.ToTypedMessage(shs),
+		})
+	}
+
 	return config, nil
 }

infra/conf/transport_internet.go

@@ -23,6 +23,7 @@ import (
 	"github.com/xtls/xray-core/transport/internet/kcp"
 	"github.com/xtls/xray-core/transport/internet/quic"
 	"github.com/xtls/xray-core/transport/internet/reality"
+	"github.com/xtls/xray-core/transport/internet/splithttp"
 	"github.com/xtls/xray-core/transport/internet/tcp"
 	"github.com/xtls/xray-core/transport/internet/tls"
 	"github.com/xtls/xray-core/transport/internet/websocket"
@@ -223,6 +224,34 @@ func (c *HttpUpgradeConfig) Build() (proto.Message, error) {
 	return config, nil
 }
 
+type SplitHTTPConfig struct {
+	Host                 string            `json:"host"`
+	Path                 string            `json:"path"`
+	Headers              map[string]string `json:"headers"`
+	MaxConcurrentUploads int32             `json:"maxConcurrentUploads"`
+	MaxUploadSize        int32             `json:"maxUploadSize"`
+}
+
+// Build implements Buildable.
+func (c *SplitHTTPConfig) Build() (proto.Message, error) {
+	// If http host is not set in the Host field, but in headers field, we add it to Host Field here.
+	// If we don't do that, http host will be overwritten as address.
+	// Host priority: Host field > headers field > address.
+	if c.Host == "" && c.Headers["host"] != "" {
+		c.Host = c.Headers["host"]
+	} else if c.Host == "" && c.Headers["Host"] != "" {
+		c.Host = c.Headers["Host"]
+	}
+	config := &splithttp.Config{
+		Path:                 c.Path,
+		Host:                 c.Host,
+		Header:               c.Headers,
+		MaxConcurrentUploads: c.MaxConcurrentUploads,
+		MaxUploadSize:        c.MaxUploadSize,
+	}
+	return config, nil
+}
+
 type HTTPConfig struct {
 	Host               *StringList            `json:"host"`
 	Path               string                 `json:"path"`
@@ -648,6 +677,8 @@ func (p TransportProtocol) Build() (string, error) {
 		return "grpc", nil
 	case "httpupgrade":
 		return "httpupgrade", nil
+	case "splithttp":
+		return "splithttp", nil
 	default:
 		return "", newError("Config: unknown transport protocol: ", p)
 	}
@@ -762,6 +793,7 @@ type StreamConfig struct {
 	GRPCConfig          *GRPCConfig         `json:"grpcSettings"`
 	GUNConfig           *GRPCConfig         `json:"gunSettings"`
 	HTTPUPGRADESettings *HttpUpgradeConfig  `json:"httpupgradeSettings"`
+	SplitHTTPSettings   *SplitHTTPConfig    `json:"splithttpSettings"`
 }
 
 // Build implements Buildable.
@@ -892,6 +924,16 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			Settings:     serial.ToTypedMessage(hs),
 		})
 	}
+	if c.SplitHTTPSettings != nil {
+		hs, err := c.SplitHTTPSettings.Build()
+		if err != nil {
+			return nil, newError("Failed to build SplitHTTP config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "splithttp",
+			Settings:     serial.ToTypedMessage(hs),
+		})
+	}
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {

infra/conf/xray.go

@@ -557,6 +557,9 @@ func applyTransportConfig(s *StreamConfig, t *TransportConfig) {
 	if s.HTTPUPGRADESettings == nil {
 		s.HTTPUPGRADESettings = t.HTTPUPGRADEConfig
 	}
+	if s.SplitHTTPSettings == nil {
+		s.SplitHTTPSettings = t.SplitHTTPConfig
+	}
 }
 
 // Build implements Buildable.

main/distro/all/all.go

@@ -57,6 +57,7 @@ import (
 	_ "github.com/xtls/xray-core/transport/internet/kcp"
 	_ "github.com/xtls/xray-core/transport/internet/quic"
 	_ "github.com/xtls/xray-core/transport/internet/reality"
+	_ "github.com/xtls/xray-core/transport/internet/splithttp"
 	_ "github.com/xtls/xray-core/transport/internet/tcp"
 	_ "github.com/xtls/xray-core/transport/internet/tls"
 	_ "github.com/xtls/xray-core/transport/internet/udp"

transport/internet/config.pb.go

@@ -31,6 +31,7 @@ const (
 	TransportProtocol_HTTP         TransportProtocol = 4
 	TransportProtocol_DomainSocket TransportProtocol = 5
 	TransportProtocol_HTTPUpgrade  TransportProtocol = 6
+	TransportProtocol_SplitHTTP    TransportProtocol = 7
 )
 
 // Enum value maps for TransportProtocol.
@@ -43,6 +44,7 @@ var (
 		4: "HTTP",
 		5: "DomainSocket",
 		6: "HTTPUpgrade",
+		7: "SplitHTTP",
 	}
 	TransportProtocol_value = map[string]int32{
 		"TCP":          0,
@@ -52,6 +54,7 @@ var (
 		"HTTP":         4,
 		"DomainSocket": 5,
 		"HTTPUpgrade":  6,
+		"SplitHTTP":    7,
 	}
 )
 
@@ -728,31 +731,32 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/config.proto

@@ -16,6 +16,7 @@ enum TransportProtocol {
   HTTP = 4;
   DomainSocket = 5;
   HTTPUpgrade = 6;
+  SplitHTTP = 7;
 }
 
 enum DomainStrategy {

transport/internet/splithttp/config.go

@@ -0,0 +1,52 @@
+package splithttp
+
+import (
+	"net/http"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/transport/internet"
+)
+
+func (c *Config) GetNormalizedPath() string {
+	path := c.Path
+	if path == "" {
+		path = "/"
+	}
+	if path[0] != '/' {
+		path = "/" + path
+	}
+	if path[len(path)-1] != '/' {
+		path = path + "/"
+	}
+	return path
+}
+
+func (c *Config) GetRequestHeader() http.Header {
+	header := http.Header{}
+	for k, v := range c.Header {
+		header.Add(k, v)
+	}
+	return header
+}
+
+func (c *Config) GetNormalizedMaxConcurrentUploads() int32 {
+	if c.MaxConcurrentUploads == 0 {
+		return 10
+	}
+
+	return c.MaxConcurrentUploads
+}
+
+func (c *Config) GetNormalizedMaxUploadSize() int32 {
+	if c.MaxUploadSize == 0 {
+		return 1000000
+	}
+
+	return c.MaxUploadSize
+}
+
+func init() {
+	common.Must(internet.RegisterProtocolConfigCreator(protocolName, func() interface{} {
+		return new(Config)
+	}))
+}

transport/internet/splithttp/config.pb.go

@@ -0,0 +1,202 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.34.1
+// 	protoc        v5.27.0
+// source: transport/internet/splithttp/config.proto
+
+package splithttp
+
+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
+
+	Host                 string            `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"`
+	Path                 string            `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	Header               map[string]string `protobuf:"bytes,3,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	MaxConcurrentUploads int32             `protobuf:"varint,4,opt,name=maxConcurrentUploads,proto3" json:"maxConcurrentUploads,omitempty"`
+	MaxUploadSize        int32             `protobuf:"varint,5,opt,name=maxUploadSize,proto3" json:"maxUploadSize,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_splithttp_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_splithttp_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_splithttp_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetHost() string {
+	if x != nil {
+		return x.Host
+	}
+	return ""
+}
+
+func (x *Config) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+func (x *Config) GetHeader() map[string]string {
+	if x != nil {
+		return x.Header
+	}
+	return nil
+}
+
+func (x *Config) GetMaxConcurrentUploads() int32 {
+	if x != nil {
+		return x.MaxConcurrentUploads
+	}
+	return 0
+}
+
+func (x *Config) GetMaxUploadSize() int32 {
+	if x != nil {
+		return x.MaxUploadSize
+	}
+	return 0
+}
+
+var File_transport_internet_splithttp_config_proto protoreflect.FileDescriptor
+
+var file_transport_internet_splithttp_config_proto_rawDesc = []byte{
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+	0x64, 0x65, 0x72, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x06, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72,
+	0x12, 0x32, 0x0a, 0x14, 0x6d, 0x61, 0x78, 0x43, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e,
+	0x74, 0x55, 0x70, 0x6c, 0x6f, 0x61, 0x64, 0x73, 0x18, 0x04, 0x20, 0x01, 0x28, 0x05, 0x52, 0x14,
+	0x6d, 0x61, 0x78, 0x43, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x55, 0x70, 0x6c,
+	0x6f, 0x61, 0x64, 0x73, 0x12, 0x24, 0x0a, 0x0d, 0x6d, 0x61, 0x78, 0x55, 0x70, 0x6c, 0x6f, 0x61,
+	0x64, 0x53, 0x69, 0x7a, 0x65, 0x18, 0x05, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0d, 0x6d, 0x61, 0x78,
+	0x55, 0x70, 0x6c, 0x6f, 0x61, 0x64, 0x53, 0x69, 0x7a, 0x65, 0x1a, 0x39, 0x0a, 0x0b, 0x48, 0x65,
+	0x61, 0x64, 0x65, 0x72, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79,
+	0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76,
+	0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75,
+	0x65, 0x3a, 0x02, 0x38, 0x01, 0x42, 0x85, 0x01, 0x0a, 0x25, 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, 0x73, 0x70, 0x6c, 0x69, 0x74, 0x68, 0x74, 0x74, 0x70, 0x50,
+	0x01, 0x5a, 0x36, 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,
+	0x73, 0x70, 0x6c, 0x69, 0x74, 0x68, 0x74, 0x74, 0x70, 0xaa, 0x02, 0x21, 0x58, 0x72, 0x61, 0x79,
+	0x2e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72,
+	0x6e, 0x65, 0x74, 0x2e, 0x53, 0x70, 0x6c, 0x69, 0x74, 0x48, 0x74, 0x74, 0x70, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_transport_internet_splithttp_config_proto_rawDescOnce sync.Once
+	file_transport_internet_splithttp_config_proto_rawDescData = file_transport_internet_splithttp_config_proto_rawDesc
+)
+
+func file_transport_internet_splithttp_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_splithttp_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_splithttp_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_splithttp_config_proto_rawDescData)
+	})
+	return file_transport_internet_splithttp_config_proto_rawDescData
+}
+
+var file_transport_internet_splithttp_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_transport_internet_splithttp_config_proto_goTypes = []interface{}{
+	(*Config)(nil), // 0: xray.transport.internet.splithttp.Config
+	nil,            // 1: xray.transport.internet.splithttp.Config.HeaderEntry
+}
+var file_transport_internet_splithttp_config_proto_depIdxs = []int32{
+	1, // 0: xray.transport.internet.splithttp.Config.header:type_name -> xray.transport.internet.splithttp.Config.HeaderEntry
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_splithttp_config_proto_init() }
+func file_transport_internet_splithttp_config_proto_init() {
+	if File_transport_internet_splithttp_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_transport_internet_splithttp_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_splithttp_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_splithttp_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_splithttp_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_splithttp_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_splithttp_config_proto = out.File
+	file_transport_internet_splithttp_config_proto_rawDesc = nil
+	file_transport_internet_splithttp_config_proto_goTypes = nil
+	file_transport_internet_splithttp_config_proto_depIdxs = nil
+}

transport/internet/splithttp/config.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package xray.transport.internet.splithttp;
+option csharp_namespace = "Xray.Transport.Internet.SplitHttp";
+option go_package = "github.com/xtls/xray-core/transport/internet/splithttp";
+option java_package = "com.xray.transport.internet.splithttp";
+option java_multiple_files = true;
+
+message Config {
+  string host = 1;
+  string path = 2;
+  map<string, string> header = 3;
+  int32 maxConcurrentUploads = 4;
+  int32 maxUploadSize = 5;
+}

transport/internet/splithttp/connection.go

@@ -0,0 +1,59 @@
+package splithttp
+
+import (
+	"io"
+	"net"
+	"time"
+)
+
+type splitConn struct {
+	writer     io.WriteCloser
+	reader     io.ReadCloser
+	remoteAddr net.Addr
+	localAddr  net.Addr
+}
+
+func (c *splitConn) Write(b []byte) (int, error) {
+	return c.writer.Write(b)
+}
+
+func (c *splitConn) Read(b []byte) (int, error) {
+	return c.reader.Read(b)
+}
+
+func (c *splitConn) Close() error {
+	err := c.writer.Close()
+	err2 := c.reader.Close()
+	if err != nil {
+		return err
+	}
+
+	if err2 != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *splitConn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *splitConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *splitConn) SetDeadline(t time.Time) error {
+	// TODO cannot do anything useful
+	return nil
+}
+
+func (c *splitConn) SetReadDeadline(t time.Time) error {
+	// TODO cannot do anything useful
+	return nil
+}
+
+func (c *splitConn) SetWriteDeadline(t time.Time) error {
+	// TODO cannot do anything useful
+	return nil
+}

transport/internet/splithttp/dialer.go

@@ -0,0 +1,316 @@
+package splithttp
+
+import (
+	"context"
+	gotls "crypto/tls"
+	"io"
+	gonet "net"
+	"net/http"
+	"net/http/httptrace"
+	"net/url"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/signal/semaphore"
+	"github.com/xtls/xray-core/common/uuid"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	"github.com/xtls/xray-core/transport/internet/tls"
+	"github.com/xtls/xray-core/transport/pipe"
+	"golang.org/x/net/http2"
+)
+
+type dialerConf struct {
+	net.Destination
+	*internet.MemoryStreamConfig
+}
+
+type reusedClient struct {
+	download *http.Client
+	upload   *http.Client
+	isH2     bool
+	// pool of net.Conn, created using dialUploadConn
+	uploadRawPool  *sync.Pool
+	dialUploadConn func(ctxInner context.Context) (net.Conn, error)
+}
+
+var (
+	globalDialerMap    map[dialerConf]reusedClient
+	globalDialerAccess sync.Mutex
+)
+
+func destroyHTTPClient(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) {
+	globalDialerAccess.Lock()
+	defer globalDialerAccess.Unlock()
+
+	if globalDialerMap == nil {
+		globalDialerMap = make(map[dialerConf]reusedClient)
+	}
+
+	delete(globalDialerMap, dialerConf{dest, streamSettings})
+
+}
+
+func getHTTPClient(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) reusedClient {
+	globalDialerAccess.Lock()
+	defer globalDialerAccess.Unlock()
+
+	if globalDialerMap == nil {
+		globalDialerMap = make(map[dialerConf]reusedClient)
+	}
+
+	if client, found := globalDialerMap[dialerConf{dest, streamSettings}]; found {
+		return client
+	}
+
+	tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
+
+	var gotlsConfig *gotls.Config
+
+	if tlsConfig != nil {
+		gotlsConfig = tlsConfig.GetTLSConfig(tls.WithDestination(dest))
+	}
+
+	dialContext := func(ctxInner context.Context) (net.Conn, error) {
+		conn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
+		if err != nil {
+			return nil, err
+		}
+
+		if gotlsConfig != nil {
+			if fingerprint := tls.GetFingerprint(tlsConfig.Fingerprint); fingerprint != nil {
+				conn = tls.UClient(conn, gotlsConfig, fingerprint)
+				if err := conn.(*tls.UConn).HandshakeContext(ctx); err != nil {
+					return nil, err
+				}
+			} else {
+				conn = tls.Client(conn, gotlsConfig)
+			}
+		}
+
+		return conn, nil
+	}
+
+	var uploadTransport http.RoundTripper
+	var downloadTransport http.RoundTripper
+
+	if tlsConfig != nil {
+		downloadTransport = &http2.Transport{
+			DialTLSContext: func(ctxInner context.Context, network string, addr string, cfg *gotls.Config) (net.Conn, error) {
+				return dialContext(ctxInner)
+			},
+			IdleConnTimeout: 90 * time.Second,
+		}
+		uploadTransport = downloadTransport
+	} else {
+		httpDialContext := func(ctxInner context.Context, network string, addr string) (net.Conn, error) {
+			return dialContext(ctxInner)
+		}
+
+		downloadTransport = &http.Transport{
+			DialTLSContext:  httpDialContext,
+			DialContext:     httpDialContext,
+			IdleConnTimeout: 90 * time.Second,
+			// chunked transfer download with keepalives is buggy with
+			// http.Client and our custom dial context.
+			DisableKeepAlives: true,
+		}
+
+		// we use uploadRawPool for that
+		uploadTransport = nil
+	}
+
+	client := reusedClient{
+		download: &http.Client{
+			Transport: downloadTransport,
+		},
+		upload: &http.Client{
+			Transport: uploadTransport,
+		},
+		isH2:           tlsConfig != nil,
+		uploadRawPool:  &sync.Pool{},
+		dialUploadConn: dialContext,
+	}
+
+	globalDialerMap[dialerConf{dest, streamSettings}] = client
+	return client
+}
+
+func init() {
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
+}
+
+func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
+	newError("dialing splithttp to ", dest).WriteToLog(session.ExportIDToError(ctx))
+
+	var requestURL url.URL
+
+	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
+	tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
+
+	maxConcurrentUploads := transportConfiguration.GetNormalizedMaxConcurrentUploads()
+	maxUploadSize := transportConfiguration.GetNormalizedMaxUploadSize()
+
+	if tlsConfig != nil {
+		requestURL.Scheme = "https"
+	} else {
+		requestURL.Scheme = "http"
+	}
+	requestURL.Host = transportConfiguration.Host
+	if requestURL.Host == "" {
+		requestURL.Host = dest.NetAddr()
+	}
+	requestURL.Path = transportConfiguration.GetNormalizedPath()
+
+	httpClient := getHTTPClient(ctx, dest, streamSettings)
+
+	var remoteAddr gonet.Addr
+	var localAddr gonet.Addr
+
+	trace := &httptrace.ClientTrace{
+		GotConn: func(connInfo httptrace.GotConnInfo) {
+			remoteAddr = connInfo.Conn.RemoteAddr()
+			localAddr = connInfo.Conn.LocalAddr()
+		},
+	}
+
+	sessionIdUuid := uuid.New()
+	sessionId := sessionIdUuid.String()
+
+	req, err := http.NewRequestWithContext(
+		httptrace.WithClientTrace(ctx, trace),
+		"GET",
+		requestURL.String()+"?session="+sessionId,
+		nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header = transportConfiguration.GetRequestHeader()
+
+	downResponse, err := httpClient.download.Do(req)
+	if err != nil {
+		// workaround for various connection pool related issues, mostly around
+		// HTTP/1.1. if the http client ever fails to send a request, we simply
+		// delete it entirely.
+		// in HTTP/1.1, it was observed that pool connections would immediately
+		// fail with "context canceled" if the previous http response body was
+		// not explicitly BOTH drained and closed. at the same time, sometimes
+		// the draining itself takes forever and causes more problems.
+		// see also https://github.com/golang/go/issues/60240
+		destroyHTTPClient(ctx, dest, streamSettings)
+		return nil, newError("failed to send download http request, destroying client").Base(err)
+	}
+
+	if downResponse.StatusCode != 200 {
+		downResponse.Body.Close()
+		return nil, newError("invalid status code on download:", downResponse.Status)
+	}
+
+	uploadUrl := requestURL.String() + "?session=" + sessionId + "&seq="
+
+	uploadPipeReader, uploadPipeWriter := pipe.New(pipe.WithSizeLimit(maxUploadSize))
+
+	go func() {
+		requestsLimiter := semaphore.New(int(maxConcurrentUploads))
+		var requestCounter int64
+
+		// by offloading the uploads into a buffered pipe, multiple conn.Write
+		// calls get automatically batched together into larger POST requests.
+		// without batching, bandwidth is extremely limited.
+		for {
+			chunk, err := uploadPipeReader.ReadMultiBuffer()
+			if err != nil {
+				break
+			}
+
+			<-requestsLimiter.Wait()
+
+			url := uploadUrl + strconv.FormatInt(requestCounter, 10)
+			requestCounter += 1
+
+			go func() {
+				defer requestsLimiter.Signal()
+				req, err := http.NewRequest("POST", url, &buf.MultiBufferContainer{MultiBuffer: chunk})
+				if err != nil {
+					newError("failed to send upload").Base(err).WriteToLog()
+					uploadPipeReader.Interrupt()
+					return
+				}
+
+				req.Header = transportConfiguration.GetRequestHeader()
+
+				if httpClient.isH2 {
+					resp, err := httpClient.upload.Do(req)
+					if err != nil {
+						newError("failed to send upload").Base(err).WriteToLog()
+						uploadPipeReader.Interrupt()
+						return
+					}
+					defer resp.Body.Close()
+
+					if resp.StatusCode != 200 {
+						newError("failed to send upload, bad status code:", resp.Status).WriteToLog()
+						uploadPipeReader.Interrupt()
+						return
+					}
+				} else {
+					var err error
+					var uploadConn any
+					for _ = range 5 {
+						uploadConn = httpClient.uploadRawPool.Get()
+						if uploadConn == nil {
+							uploadConn, err = httpClient.dialUploadConn(ctx)
+							if err != nil {
+								newError("failed to connect upload").Base(err).WriteToLog()
+								uploadPipeReader.Interrupt()
+								return
+							}
+						}
+
+						err = req.Write(uploadConn.(net.Conn))
+						if err == nil {
+							break
+						}
+					}
+
+					if err != nil {
+						newError("failed to send upload").Base(err).WriteToLog()
+						uploadPipeReader.Interrupt()
+						return
+					}
+
+					httpClient.uploadRawPool.Put(uploadConn)
+				}
+			}()
+
+		}
+	}()
+
+	// skip "ok" response
+	trashHeader := []byte{0, 0}
+	_, err = io.ReadFull(downResponse.Body, trashHeader)
+	if err != nil {
+		downResponse.Body.Close()
+		return nil, newError("failed to read initial response")
+	}
+
+	// necessary in order to send larger chunks in upload
+	bufferedUploadPipeWriter := buf.NewBufferedWriter(uploadPipeWriter)
+	bufferedUploadPipeWriter.SetBuffered(false)
+
+	conn := splitConn{
+		writer:     bufferedUploadPipeWriter,
+		reader:     downResponse.Body,
+		remoteAddr: remoteAddr,
+		localAddr:  localAddr,
+	}
+
+	return stat.Connection(&conn), nil
+}

transport/internet/splithttp/errors.generated.go

@@ -0,0 +1,9 @@
+package splithttp
+
+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/splithttp/hub.go

@@ -0,0 +1,262 @@
+package splithttp
+
+import (
+	"context"
+	"crypto/tls"
+	"io"
+	gonet "net"
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	http_proto "github.com/xtls/xray-core/common/protocol/http"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/signal/done"
+	"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 requestHandler struct {
+	host      string
+	path      string
+	ln        *Listener
+	sessions  sync.Map
+	localAddr gonet.TCPAddr
+}
+
+func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	if len(h.host) > 0 && request.Host != h.host {
+		newError("failed to validate host, request:", request.Host, ", config:", h.host).WriteToLog()
+		writer.WriteHeader(http.StatusNotFound)
+		return
+	}
+	if request.URL.Path != h.path {
+		newError("failed to validate path, request:", request.URL.Path, ", config:", h.path).WriteToLog()
+		writer.WriteHeader(http.StatusNotFound)
+		return
+	}
+
+	queryString := request.URL.Query()
+	sessionId := queryString.Get("session")
+	if sessionId == "" {
+		newError("no sessionid on request:", request.URL.Path).WriteToLog()
+		writer.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	forwardedAddrs := http_proto.ParseXForwardedFor(request.Header)
+	remoteAddr, err := gonet.ResolveTCPAddr("tcp", request.RemoteAddr)
+	if err != nil {
+		remoteAddr = &gonet.TCPAddr{}
+	}
+	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
+		remoteAddr = &net.TCPAddr{
+			IP:   forwardedAddrs[0].IP(),
+			Port: int(0),
+		}
+	}
+
+	if request.Method == "POST" {
+		uploadQueue, ok := h.sessions.Load(sessionId)
+		if !ok {
+			newError("sessionid does not exist").WriteToLog()
+			writer.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		seq := queryString.Get("seq")
+		if seq == "" {
+			newError("no seq on request:", request.URL.Path).WriteToLog()
+			writer.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		payload, err := io.ReadAll(request.Body)
+		if err != nil {
+			newError("failed to upload").Base(err).WriteToLog()
+			writer.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		seqInt, err := strconv.ParseUint(seq, 10, 64)
+		if err != nil {
+			newError("failed to upload").Base(err).WriteToLog()
+			writer.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		err = uploadQueue.(*UploadQueue).Push(Packet{
+			Payload: payload,
+			Seq:     seqInt,
+		})
+
+		if err != nil {
+			newError("failed to upload").Base(err).WriteToLog()
+			writer.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		writer.WriteHeader(http.StatusOK)
+	} else if request.Method == "GET" {
+		responseFlusher, ok := writer.(http.Flusher)
+		if !ok {
+			panic("expected http.ResponseWriter to be an http.Flusher")
+		}
+
+		uploadQueue := NewUploadQueue(int(2 * h.ln.config.GetNormalizedMaxConcurrentUploads()))
+
+		h.sessions.Store(sessionId, uploadQueue)
+		// the connection is finished, clean up map
+		defer h.sessions.Delete(sessionId)
+
+		// magic header instructs nginx + apache to not buffer response body
+		writer.Header().Set("X-Accel-Buffering", "no")
+		writer.WriteHeader(http.StatusOK)
+		// send a chunk immediately to enable CDN streaming.
+		// many CDN buffer the response headers until the origin starts sending
+		// the body, with no way to turn it off.
+		writer.Write([]byte("ok"))
+		responseFlusher.Flush()
+
+		downloadDone := done.New()
+
+		conn := splitConn{
+			writer: &httpResponseBodyWriter{
+				responseWriter:  writer,
+				downloadDone:    downloadDone,
+				responseFlusher: responseFlusher,
+			},
+			reader:     uploadQueue,
+			remoteAddr: remoteAddr,
+		}
+
+		h.ln.addConn(stat.Connection(&conn))
+
+		// "A ResponseWriter may not be used after [Handler.ServeHTTP] has returned."
+		<-downloadDone.Wait()
+
+	} else {
+		writer.WriteHeader(http.StatusMethodNotAllowed)
+	}
+}
+
+type httpResponseBodyWriter struct {
+	sync.Mutex
+	responseWriter  http.ResponseWriter
+	responseFlusher http.Flusher
+	downloadDone    *done.Instance
+}
+
+func (c *httpResponseBodyWriter) Write(b []byte) (int, error) {
+	c.Lock()
+	defer c.Unlock()
+	if c.downloadDone.Done() {
+		return 0, io.ErrClosedPipe
+	}
+	n, err := c.responseWriter.Write(b)
+	if err == nil {
+		c.responseFlusher.Flush()
+	}
+	return n, err
+}
+
+func (c *httpResponseBodyWriter) Close() error {
+	c.Lock()
+	defer c.Unlock()
+	c.downloadDone.Close()
+	return nil
+}
+
+type Listener struct {
+	sync.Mutex
+	server   http.Server
+	listener net.Listener
+	config   *Config
+	addConn  internet.ConnHandler
+}
+
+func ListenSH(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) {
+	l := &Listener{
+		addConn: addConn,
+	}
+	shSettings := streamSettings.ProtocolSettings.(*Config)
+	l.config = shSettings
+	if l.config != nil {
+		if streamSettings.SocketSettings == nil {
+			streamSettings.SocketSettings = &internet.SocketConfig{}
+		}
+	}
+	var listener net.Listener
+	var err error
+	var localAddr = gonet.TCPAddr{}
+
+	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 SH) on ", address).Base(err)
+		}
+		newError("listening unix domain socket(for SH) on ", address).WriteToLog(session.ExportIDToError(ctx))
+	} else { // tcp
+		localAddr = gonet.TCPAddr{
+			IP:   address.IP(),
+			Port: int(port),
+		}
+		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 SH) on ", address, ":", port).Base(err)
+		}
+		newError("listening TCP(for SH) on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
+	}
+
+	if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil {
+		if tlsConfig := config.GetTLSConfig(); tlsConfig != nil {
+			listener = tls.NewListener(listener, tlsConfig)
+		}
+	}
+
+	l.listener = listener
+
+	l.server = http.Server{
+		Handler: &requestHandler{
+			host:      shSettings.Host,
+			path:      shSettings.GetNormalizedPath(),
+			ln:        l,
+			sessions:  sync.Map{},
+			localAddr: localAddr,
+		},
+		ReadHeaderTimeout: time.Second * 4,
+		MaxHeaderBytes:    8192,
+	}
+
+	go func() {
+		if err := l.server.Serve(l.listener); err != nil {
+			newError("failed to serve http for splithttp").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
+		}
+	}()
+
+	return l, err
+}
+
+// Addr implements net.Listener.Addr().
+func (ln *Listener) Addr() net.Addr {
+	return ln.listener.Addr()
+}
+
+// Close implements net.Listener.Close().
+func (ln *Listener) Close() error {
+	return ln.listener.Close()
+}
+
+func init() {
+	common.Must(internet.RegisterTransportListener(protocolName, ListenSH))
+}

transport/internet/splithttp/splithttp.go

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

transport/internet/splithttp/splithttp_test.go

@@ -0,0 +1,154 @@
+package splithttp_test
+
+import (
+	"context"
+	"fmt"
+	"runtime"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol/tls/cert"
+	"github.com/xtls/xray-core/testing/servers/tcp"
+	"github.com/xtls/xray-core/transport/internet"
+	. "github.com/xtls/xray-core/transport/internet/splithttp"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+func Test_listenSHAndDial(t *testing.T) {
+	listenPort := tcp.PickPort()
+	listen, err := ListenSH(context.Background(), net.LocalHostIP, listenPort, &internet.MemoryStreamConfig{
+		ProtocolName: "splithttp",
+		ProtocolSettings: &Config{
+			Path: "/sh",
+		},
+	}, func(conn stat.Connection) {
+		go func(c stat.Connection) {
+			defer c.Close()
+
+			var b [1024]byte
+			_, err := c.Read(b[:])
+			if err != nil {
+				return
+			}
+
+			common.Must2(c.Write([]byte("Response")))
+		}(conn)
+	})
+	common.Must(err)
+	ctx := context.Background()
+	streamSettings := &internet.MemoryStreamConfig{
+		ProtocolName:     "splithttp",
+		ProtocolSettings: &Config{Path: "sh"},
+	}
+	conn, err := Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), listenPort), streamSettings)
+
+	common.Must(err)
+	_, err = conn.Write([]byte("Test connection 1"))
+	common.Must(err)
+
+	var b [1024]byte
+	fmt.Println("test2")
+	n, _ := conn.Read(b[:])
+	fmt.Println("string is", n)
+	if string(b[:n]) != "Response" {
+		t.Error("response: ", string(b[:n]))
+	}
+
+	common.Must(conn.Close())
+	<-time.After(time.Second * 5)
+	conn, err = Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), listenPort), streamSettings)
+	common.Must(err)
+	_, err = conn.Write([]byte("Test connection 2"))
+	common.Must(err)
+	n, _ = conn.Read(b[:])
+	common.Must(err)
+	if string(b[:n]) != "Response" {
+		t.Error("response: ", string(b[:n]))
+	}
+	common.Must(conn.Close())
+
+	common.Must(listen.Close())
+}
+
+func TestDialWithRemoteAddr(t *testing.T) {
+	listenPort := tcp.PickPort()
+	listen, err := ListenSH(context.Background(), net.LocalHostIP, listenPort, &internet.MemoryStreamConfig{
+		ProtocolName: "splithttp",
+		ProtocolSettings: &Config{
+			Path: "sh",
+		},
+	}, func(conn stat.Connection) {
+		go func(c stat.Connection) {
+			defer c.Close()
+
+			var b [1024]byte
+			_, err := c.Read(b[:])
+			// common.Must(err)
+			if err != nil {
+				return
+			}
+
+			_, err = c.Write([]byte("Response"))
+			common.Must(err)
+		}(conn)
+	})
+	common.Must(err)
+
+	conn, err := Dial(context.Background(), net.TCPDestination(net.DomainAddress("localhost"), listenPort), &internet.MemoryStreamConfig{
+		ProtocolName:     "splithttp",
+		ProtocolSettings: &Config{Path: "sh", Header: map[string]string{"X-Forwarded-For": "1.1.1.1"}},
+	})
+
+	common.Must(err)
+	_, err = conn.Write([]byte("Test connection 1"))
+	common.Must(err)
+
+	var b [1024]byte
+	n, _ := conn.Read(b[:])
+	if string(b[:n]) != "Response" {
+		t.Error("response: ", string(b[:n]))
+	}
+
+	common.Must(listen.Close())
+}
+
+func Test_listenSHAndDial_TLS(t *testing.T) {
+	if runtime.GOARCH == "arm64" {
+		return
+	}
+
+	listenPort := tcp.PickPort()
+
+	start := time.Now()
+
+	streamSettings := &internet.MemoryStreamConfig{
+		ProtocolName: "splithttp",
+		ProtocolSettings: &Config{
+			Path: "shs",
+		},
+		SecurityType: "tls",
+		SecuritySettings: &tls.Config{
+			AllowInsecure: true,
+			Certificate:   []*tls.Certificate{tls.ParseCertificate(cert.MustGenerate(nil, cert.CommonName("localhost")))},
+		},
+	}
+	listen, err := ListenSH(context.Background(), net.LocalHostIP, listenPort, streamSettings, func(conn stat.Connection) {
+		go func() {
+			_ = conn.Close()
+		}()
+	})
+	common.Must(err)
+	defer listen.Close()
+
+	conn, err := Dial(context.Background(), net.TCPDestination(net.DomainAddress("localhost"), listenPort), streamSettings)
+	common.Must(err)
+	_ = conn.Close()
+
+	end := time.Now()
+	if !end.Before(start.Add(time.Second * 5)) {
+		t.Error("end: ", end, " start: ", start)
+	}
+}

transport/internet/splithttp/upload_queue.go

@@ -0,0 +1,120 @@
+package splithttp
+
+// upload_queue is a specialized priorityqueue + channel to reorder generic
+// packets by a sequence number
+
+import (
+	"container/heap"
+	"io"
+)
+
+type Packet struct {
+	Payload []byte
+	Seq     uint64
+}
+
+type UploadQueue struct {
+	pushedPackets chan Packet
+	heap          uploadHeap
+	nextSeq       uint64
+	closed        bool
+	maxPackets    int
+}
+
+func NewUploadQueue(maxPackets int) *UploadQueue {
+	return &UploadQueue{
+		pushedPackets: make(chan Packet, maxPackets),
+		heap:          uploadHeap{},
+		nextSeq:       0,
+		closed:        false,
+		maxPackets:    maxPackets,
+	}
+}
+
+func (h *UploadQueue) Push(p Packet) error {
+	if h.closed {
+		return newError("splithttp packet queue closed")
+	}
+
+	h.pushedPackets <- p
+	return nil
+}
+
+func (h *UploadQueue) Close() error {
+	h.closed = true
+	close(h.pushedPackets)
+	return nil
+}
+
+func (h *UploadQueue) Read(b []byte) (int, error) {
+	if h.closed && len(h.heap) == 0 && len(h.pushedPackets) == 0 {
+		return 0, io.EOF
+	}
+
+	needMorePackets := false
+
+	if len(h.heap) > 0 {
+		packet := heap.Pop(&h.heap).(Packet)
+		n := 0
+
+		if packet.Seq == h.nextSeq {
+			copy(b, packet.Payload)
+			n = min(len(b), len(packet.Payload))
+
+			if n < len(packet.Payload) {
+				// partial read
+				packet.Payload = packet.Payload[n:]
+				heap.Push(&h.heap, packet)
+			} else {
+				h.nextSeq = packet.Seq + 1
+			}
+
+			return n, nil
+		}
+
+		// misordered packet
+		if packet.Seq > h.nextSeq {
+			if len(h.heap) > h.maxPackets {
+				// the "reassembly buffer" is too large, and we want to
+				// constrain memory usage somehow. let's tear down the
+				// connection, and hope the application retries.
+				return 0, newError("packet queue is too large")
+			}
+			heap.Push(&h.heap, packet)
+			needMorePackets = true
+		}
+	} else {
+		needMorePackets = true
+	}
+
+	if needMorePackets {
+		packet, more := <-h.pushedPackets
+		if !more {
+			return 0, io.EOF
+		}
+		heap.Push(&h.heap, packet)
+	}
+
+	return 0, nil
+}
+
+// heap code directly taken from https://pkg.go.dev/container/heap
+type uploadHeap []Packet
+
+func (h uploadHeap) Len() int           { return len(h) }
+func (h uploadHeap) Less(i, j int) bool { return h[i].Seq < h[j].Seq }
+func (h uploadHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+
+func (h *uploadHeap) Push(x any) {
+	// Push and Pop use pointer receivers because they modify the slice's length,
+	// not just its contents.
+	*h = append(*h, x.(Packet))
+}
+
+func (h *uploadHeap) Pop() any {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}