diff --git a/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_client.json b/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_client.json
new file mode 100644
index 000000000..acaf4be88
--- /dev/null
+++ b/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_client.json
@@ -0,0 +1,48 @@
+{
+  "log": {
+    "error": {
+      "level": "Debug",
+      "type": "Console"
+    },
+    "access": {
+      "type": "None"
+    }
+  },
+  "outbounds": [
+    {
+      "protocol": "vmess",
+      "settings": {
+        "address": "127.0.0.1",
+        "port": 17793,
+        "uuid": "bcc71618-e552-42c2-a2a3-d4c17a9df764"
+      },
+      "streamSettings": {
+        "transport": "httpupgrade",
+        "transportSettings": {
+          "path": "b66efc0c7752",
+          "maxEarlyData": 32,
+          "earlyDataHeaderName": "Sec-Websocket-Key"
+        },
+        "security": "tls",
+        "securitySettings": {
+          "pinnedPeerCertificateChainSha256": [
+            "kqHyvea27Pn+JiSqA72lhu9IKAKeGR+3yCyA8JR1mug="
+          ],
+          "allowInsecureIfPinnedPeerCertificate": true
+        }
+      }
+    }
+  ],
+  "inbounds": [
+    {
+      "protocol": "socks",
+      "settings": {
+        "udpEnabled": false,
+        "address": "127.0.0.1",
+        "packetEncoding": "Packet"
+      },
+      "port": 17794,
+      "listen": "127.0.0.1"
+    }
+  ]
+}
diff --git a/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_server.json b/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_server.json
new file mode 100644
index 000000000..083adf30c
--- /dev/null
+++ b/testing/scenarios/config/httpupgrade_earlydataShortEarlyData_server.json
@@ -0,0 +1,46 @@
+{
+  "log": {
+    "error": {
+      "level": "Debug",
+      "type": "Console"
+    },
+    "access": {
+      "type": "None"
+    }
+  },
+  "outbounds": [
+    {
+      "protocol": "freedom"
+    }
+  ],
+  "inbounds": [
+    {
+      "listen": "127.0.0.1",
+      "port": 17793,
+      "protocol": "vmess",
+      "settings": {
+        "users": [
+          "bcc71618-e552-42c2-a2a3-d4c17a9df764"
+        ]
+      },
+      "streamSettings": {
+        "transport": "httpupgrade",
+        "transportSettings": {
+          "path": "b66efc0c7752",
+          "maxEarlyData": 32,
+          "earlyDataHeaderName": "Sec-Websocket-Key"
+        },
+        "security": "tls",
+        "securitySettings": {
+          "certificate": [
+            {
+              "usage": "ENCIPHERMENT",
+              "certificateFile": "cert/self-signed_cert.pem",
+              "keyFile": "cert/self-signed_key.pem"
+            }
+          ]
+        }
+      }
+    }
+  ]
+}
diff --git a/testing/scenarios/config/httpupgrade_earlydata_client.json b/testing/scenarios/config/httpupgrade_earlydata_client.json
new file mode 100644
index 000000000..2e34ccce2
--- /dev/null
+++ b/testing/scenarios/config/httpupgrade_earlydata_client.json
@@ -0,0 +1,48 @@
+{
+  "log": {
+    "error": {
+      "level": "Debug",
+      "type": "Console"
+    },
+    "access": {
+      "type": "None"
+    }
+  },
+  "outbounds": [
+    {
+      "protocol": "vmess",
+      "settings": {
+        "address": "127.0.0.1",
+        "port": 17793,
+        "uuid": "bcc71618-e552-42c2-a2a3-d4c17a9df764"
+      },
+      "streamSettings": {
+        "transport": "httpupgrade",
+        "transportSettings": {
+          "path": "b66efc0c7752",
+          "maxEarlyData": 2048,
+          "earlyDataHeaderName": "Sec-Websocket-Key"
+        },
+        "security": "tls",
+        "securitySettings": {
+          "pinnedPeerCertificateChainSha256": [
+            "kqHyvea27Pn+JiSqA72lhu9IKAKeGR+3yCyA8JR1mug="
+          ],
+          "allowInsecureIfPinnedPeerCertificate": true
+        }
+      }
+    }
+  ],
+  "inbounds": [
+    {
+      "protocol": "socks",
+      "settings": {
+        "udpEnabled": false,
+        "address": "127.0.0.1",
+        "packetEncoding": "Packet"
+      },
+      "port": 17794,
+      "listen": "127.0.0.1"
+    }
+  ]
+}
diff --git a/testing/scenarios/config/httpupgrade_earlydata_server.json b/testing/scenarios/config/httpupgrade_earlydata_server.json
new file mode 100644
index 000000000..dde2515ec
--- /dev/null
+++ b/testing/scenarios/config/httpupgrade_earlydata_server.json
@@ -0,0 +1,46 @@
+{
+  "log": {
+    "error": {
+      "level": "Debug",
+      "type": "Console"
+    },
+    "access": {
+      "type": "None"
+    }
+  },
+  "outbounds": [
+    {
+      "protocol": "freedom"
+    }
+  ],
+  "inbounds": [
+    {
+      "listen": "127.0.0.1",
+      "port": 17793,
+      "protocol": "vmess",
+      "settings": {
+        "users": [
+          "bcc71618-e552-42c2-a2a3-d4c17a9df764"
+        ]
+      },
+      "streamSettings": {
+        "transport": "httpupgrade",
+        "transportSettings": {
+          "path": "b66efc0c7752",
+          "maxEarlyData": 2048,
+          "earlyDataHeaderName": "Sec-Websocket-Key"
+        },
+        "security": "tls",
+        "securitySettings": {
+          "certificate": [
+            {
+              "usage": "ENCIPHERMENT",
+              "certificateFile": "cert/self-signed_cert.pem",
+              "keyFile": "cert/self-signed_key.pem"
+            }
+          ]
+        }
+      }
+    }
+  ]
+}
diff --git a/testing/scenarios/httpupgrade_test.go b/testing/scenarios/httpupgrade_test.go
index 6a7366c3b..20bc779fb 100644
--- a/testing/scenarios/httpupgrade_test.go
+++ b/testing/scenarios/httpupgrade_test.go
@@ -50,3 +50,81 @@ func TestHTTPUpgrade(t *testing.T) {
 		t.Error(err)
 	}
 }
+
+func TestHTTPUpgradeWithEarlyData(t *testing.T) {
+	tcpServer := tcp.Server{
+		MsgProcessor: xor,
+	}
+	dest, err := tcpServer.Start()
+	common.Must(err)
+	defer tcpServer.Close()
+
+	coreInst, InstMgrIfce := NewInstanceManagerCoreInstance()
+	defer coreInst.Close()
+
+	common.Must(InstMgrIfce.AddInstance(
+		context.TODO(),
+		"httpupgrade_client",
+		common.Must2(os.ReadFile("config/httpupgrade_earlydata_client.json")).([]byte),
+		"jsonv5"))
+
+	common.Must(InstMgrIfce.AddInstance(
+		context.TODO(),
+		"httpupgrade_server",
+		common.Must2(os.ReadFile("config/httpupgrade_earlydata_server.json")).([]byte),
+		"jsonv5"))
+
+	common.Must(InstMgrIfce.StartInstance(context.TODO(), "httpupgrade_server"))
+	common.Must(InstMgrIfce.StartInstance(context.TODO(), "httpupgrade_client"))
+
+	defer func() {
+		common.Must(InstMgrIfce.StopInstance(context.TODO(), "httpupgrade_server"))
+		common.Must(InstMgrIfce.StopInstance(context.TODO(), "httpupgrade_client"))
+		common.Must(InstMgrIfce.UntrackInstance(context.TODO(), "httpupgrade_server"))
+		common.Must(InstMgrIfce.UntrackInstance(context.TODO(), "httpupgrade_client"))
+		coreInst.Close()
+	}()
+
+	if err := testTCPConnViaSocks(17794, dest.Port, 1024, time.Second*2)(); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestHTTPUpgradeWithShortEarlyData(t *testing.T) {
+	tcpServer := tcp.Server{
+		MsgProcessor: xor,
+	}
+	dest, err := tcpServer.Start()
+	common.Must(err)
+	defer tcpServer.Close()
+
+	coreInst, InstMgrIfce := NewInstanceManagerCoreInstance()
+	defer coreInst.Close()
+
+	common.Must(InstMgrIfce.AddInstance(
+		context.TODO(),
+		"httpupgrade_client",
+		common.Must2(os.ReadFile("config/httpupgrade_earlydataShortEarlyData_client.json")).([]byte),
+		"jsonv5"))
+
+	common.Must(InstMgrIfce.AddInstance(
+		context.TODO(),
+		"httpupgrade_server",
+		common.Must2(os.ReadFile("config/httpupgrade_earlydataShortEarlyData_server.json")).([]byte),
+		"jsonv5"))
+
+	common.Must(InstMgrIfce.StartInstance(context.TODO(), "httpupgrade_server"))
+	common.Must(InstMgrIfce.StartInstance(context.TODO(), "httpupgrade_client"))
+
+	defer func() {
+		common.Must(InstMgrIfce.StopInstance(context.TODO(), "httpupgrade_server"))
+		common.Must(InstMgrIfce.StopInstance(context.TODO(), "httpupgrade_client"))
+		common.Must(InstMgrIfce.UntrackInstance(context.TODO(), "httpupgrade_server"))
+		common.Must(InstMgrIfce.UntrackInstance(context.TODO(), "httpupgrade_client"))
+		coreInst.Close()
+	}()
+
+	if err := testTCPConnViaSocks(17794, dest.Port, 1024, time.Second*2)(); err != nil {
+		t.Error(err)
+	}
+}
diff --git a/transport/internet/httpupgrade/config.pb.go b/transport/internet/httpupgrade/config.pb.go
index b6fba507f..7c17b037d 100644
--- a/transport/internet/httpupgrade/config.pb.go
+++ b/transport/internet/httpupgrade/config.pb.go
@@ -16,21 +16,20 @@ const (
 )
 
 type Config struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Path string `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
-	Host string `protobuf:"bytes,2,opt,name=host,proto3" json:"host,omitempty"`
+	state               protoimpl.MessageState `protogen:"open.v1"`
+	Path                string                 `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
+	Host                string                 `protobuf:"bytes,2,opt,name=host,proto3" json:"host,omitempty"`
+	MaxEarlyData        int32                  `protobuf:"varint,3,opt,name=max_early_data,json=maxEarlyData,proto3" json:"max_early_data,omitempty"`
+	EarlyDataHeaderName string                 `protobuf:"bytes,4,opt,name=early_data_header_name,json=earlyDataHeaderName,proto3" json:"early_data_header_name,omitempty"`
+	unknownFields       protoimpl.UnknownFields
+	sizeCache           protoimpl.SizeCache
 }
 
 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)
-	}
+	mi := &file_transport_internet_httpupgrade_config_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Config) String() string {
@@ -41,7 +40,7 @@ func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
 	mi := &file_transport_internet_httpupgrade_config_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -70,6 +69,20 @@ func (x *Config) GetHost() string {
 	return ""
 }
 
+func (x *Config) GetMaxEarlyData() int32 {
+	if x != nil {
+		return x.MaxEarlyData
+	}
+	return 0
+}
+
+func (x *Config) GetEarlyDataHeaderName() string {
+	if x != nil {
+		return x.EarlyDataHeaderName
+	}
+	return ""
+}
+
 var File_transport_internet_httpupgrade_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_httpupgrade_config_proto_rawDesc = []byte{
@@ -81,22 +94,28 @@ var file_transport_internet_httpupgrade_config_proto_rawDesc = []byte{
 	0x75, 0x65, 0x73, 0x74, 0x2e, 0x68, 0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61, 0x64, 0x65,
 	0x1a, 0x20, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x65, 0x78,
 	0x74, 0x2f, 0x65, 0x78, 0x74, 0x65, 0x6e, 0x73, 0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x22, 0x52, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04,
-	0x70, 0x61, 0x74, 0x68, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x70, 0x61, 0x74, 0x68,
-	0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
-	0x68, 0x6f, 0x73, 0x74, 0x3a, 0x20, 0x82, 0xb5, 0x18, 0x1c, 0x0a, 0x09, 0x74, 0x72, 0x61, 0x6e,
-	0x73, 0x70, 0x6f, 0x72, 0x74, 0x12, 0x0b, 0x68, 0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61,
-	0x64, 0x65, 0x90, 0xff, 0x29, 0x01, 0x42, 0x9c, 0x01, 0x0a, 0x2d, 0x63, 0x6f, 0x6d, 0x2e, 0x76,
-	0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 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, 0x3d, 0x67, 0x69, 0x74, 0x68,
-	0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x76, 0x32, 0x66, 0x6c, 0x79, 0x2f, 0x76, 0x32, 0x72,
-	0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x76, 0x35, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73,
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-	0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74,
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-	0x67, 0x72, 0x61, 0x64, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x74, 0x6f, 0x22, 0xad, 0x01, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a,
+	0x04, 0x70, 0x61, 0x74, 0x68, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x70, 0x61, 0x74,
+	0x68, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x04, 0x68, 0x6f, 0x73, 0x74, 0x12, 0x24, 0x0a, 0x0e, 0x6d, 0x61, 0x78, 0x5f, 0x65, 0x61, 0x72,
+	0x6c, 0x79, 0x5f, 0x64, 0x61, 0x74, 0x61, 0x18, 0x03, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0c, 0x6d,
+	0x61, 0x78, 0x45, 0x61, 0x72, 0x6c, 0x79, 0x44, 0x61, 0x74, 0x61, 0x12, 0x33, 0x0a, 0x16, 0x65,
+	0x61, 0x72, 0x6c, 0x79, 0x5f, 0x64, 0x61, 0x74, 0x61, 0x5f, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72,
+	0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x13, 0x65, 0x61, 0x72,
+	0x6c, 0x79, 0x44, 0x61, 0x74, 0x61, 0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x4e, 0x61, 0x6d, 0x65,
+	0x3a, 0x20, 0x82, 0xb5, 0x18, 0x1c, 0x0a, 0x09, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72,
+	0x74, 0x12, 0x0b, 0x68, 0x74, 0x74, 0x70, 0x75, 0x70, 0x67, 0x72, 0x61, 0x64, 0x65, 0x90, 0xff,
+	0x29, 0x01, 0x42, 0x9c, 0x01, 0x0a, 0x2d, 0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79,
+	0x2e, 0x63, 0x6f, 0x72, 0x65, 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, 0x3d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63,
+	0x6f, 0x6d, 0x2f, 0x76, 0x32, 0x66, 0x6c, 0x79, 0x2f, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2d, 0x63,
+	0x6f, 0x72, 0x65, 0x2f, 0x76, 0x35, 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, 0x29, 0x56, 0x32, 0x52, 0x61, 0x79, 0x2e, 0x43, 0x6f,
+	0x72, 0x65, 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 (
@@ -112,7 +131,7 @@ func file_transport_internet_httpupgrade_config_proto_rawDescGZIP() []byte {
 }
 
 var file_transport_internet_httpupgrade_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_httpupgrade_config_proto_goTypes = []interface{}{
+var file_transport_internet_httpupgrade_config_proto_goTypes = []any{
 	(*Config)(nil), // 0: v2ray.core.transport.internet.request.httpupgrade.Config
 }
 var file_transport_internet_httpupgrade_config_proto_depIdxs = []int32{
@@ -128,20 +147,6 @@ 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{
diff --git a/transport/internet/httpupgrade/connection.go b/transport/internet/httpupgrade/connection.go
index e7bd727ee..6a43a4384 100644
--- a/transport/internet/httpupgrade/connection.go
+++ b/transport/internet/httpupgrade/connection.go
@@ -1,7 +1,6 @@
 package httpupgrade
 
 import (
-	"bytes"
 	"context"
 	"github.com/v2fly/v2ray-core/v5/common/buf"
 	"github.com/v2fly/v2ray-core/v5/common/net"
@@ -18,14 +17,12 @@ type connection struct {
 	shouldWait        bool
 	delayedDialFinish context.Context
 	finishedDial      context.CancelFunc
-	dialer            DelayedDialer
+	dialer            delayedDialer
 }
 
-type DelayedDialer interface {
-	Dial(earlyData []byte) (conn net.Conn, earlyReply []byte, err error)
-}
+type delayedDialer func(earlyData []byte) (conn net.Conn, earlyReply io.Reader, err error)
 
-func newConnectionWithEarlyReply(conn net.Conn, remoteAddr net.Addr, earlyReplyReader io.Reader) *connection {
+func newConnectionWithPendingRead(conn net.Conn, remoteAddr net.Addr, earlyReplyReader io.Reader) *connection {
 	return &connection{
 		conn:       conn,
 		remoteAddr: remoteAddr,
@@ -33,6 +30,16 @@ func newConnectionWithEarlyReply(conn net.Conn, remoteAddr net.Addr, earlyReplyR
 	}
 }
 
+func newConnectionWithDelayedDial(dialer delayedDialer) *connection {
+	ctx, cancel := context.WithCancel(context.Background())
+	return &connection{
+		shouldWait:        true,
+		delayedDialFinish: ctx,
+		finishedDial:      cancel,
+		dialer:            dialer,
+	}
+}
+
 // Read implements net.Conn.Read()
 func (c *connection) Read(b []byte) (int, error) {
 	if c.shouldWait {
@@ -57,10 +64,10 @@ func (c *connection) Read(b []byte) (int, error) {
 func (c *connection) Write(b []byte) (int, error) {
 	if c.shouldWait {
 		var err error
-		var earlyReply []byte
-		c.conn, earlyReply, err = c.dialer.Dial(b)
+		var earlyReply io.Reader
+		c.conn, earlyReply, err = c.dialer(b)
 		if earlyReply != nil {
-			c.reader = bytes.NewReader(earlyReply)
+			c.reader = earlyReply
 		}
 		c.finishedDial()
 		if err != nil {
diff --git a/transport/internet/httpupgrade/dialer.go b/transport/internet/httpupgrade/dialer.go
index 21c4ea75e..5e6d162dd 100644
--- a/transport/internet/httpupgrade/dialer.go
+++ b/transport/internet/httpupgrade/dialer.go
@@ -3,6 +3,7 @@ package httpupgrade
 import (
 	"bufio"
 	"context"
+	"encoding/base64"
 	"io"
 	"net/http"
 	"strings"
@@ -17,39 +18,72 @@ import (
 func dialhttpUpgrade(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (net.Conn, error) {
 	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
 
-	conn, err := transportcommon.DialWithSecuritySettings(ctx, dest, streamSettings)
-	if err != nil {
-		return nil, newError("failed to dial request to ", dest).Base(err)
-	}
-	req, err := http.NewRequest("GET", transportConfiguration.GetNormalizedPath(), nil)
-	if err != nil {
-		return nil, err
+	dialer := func(earlyData []byte) (net.Conn, io.Reader, error) {
+		conn, err := transportcommon.DialWithSecuritySettings(ctx, dest, streamSettings)
+		if err != nil {
+			return nil, nil, newError("failed to dial request to ", dest).Base(err)
+		}
+		req, err := http.NewRequest("GET", transportConfiguration.GetNormalizedPath(), nil)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		req.Header.Set("Connection", "upgrade")
+		req.Header.Set("Upgrade", "websocket")
+		req.Host = transportConfiguration.Host
+
+		earlyDataSize := len(earlyData)
+		if earlyDataSize > int(transportConfiguration.MaxEarlyData) {
+			earlyDataSize = int(transportConfiguration.MaxEarlyData)
+		}
+
+		if earlyData != nil && len(earlyData) > 0 {
+			if transportConfiguration.EarlyDataHeaderName == "" {
+				return nil, nil, newError("EarlyDataHeaderName is not set")
+			}
+			req.Header.Set(transportConfiguration.EarlyDataHeaderName, base64.URLEncoding.EncodeToString(earlyData))
+		}
+
+		err = req.Write(conn)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		if earlyData != nil && len(earlyData[earlyDataSize:]) > 0 {
+			_, err = conn.Write(earlyData[earlyDataSize:])
+			if err != nil {
+				return nil, nil, newError("failed to finish write early data").Base(err)
+			}
+		}
+
+		bufferedConn := bufio.NewReader(conn)
+		resp, err := http.ReadResponse(bufferedConn, req) // nolint:bodyclose
+		if err != nil {
+			return nil, nil, err
+		}
+
+		if resp.Status == "101 Switching Protocols" &&
+			strings.ToLower(resp.Header.Get("Upgrade")) == "websocket" &&
+			strings.ToLower(resp.Header.Get("Connection")) == "upgrade" {
+
+			earlyReplyReader := io.LimitReader(bufferedConn, int64(bufferedConn.Buffered()))
+			return conn, earlyReplyReader, nil
+		}
+
+		return nil, nil, newError("unrecognized reply")
 	}
 
-	req.Header.Set("Connection", "upgrade")
-	req.Header.Set("Upgrade", "websocket")
-	req.Host = transportConfiguration.Host
-
-	err = req.Write(conn)
-	if err != nil {
-		return nil, err
-	}
-
-	bufferedConn := bufio.NewReader(conn)
-	resp, err := http.ReadResponse(bufferedConn, 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" {
-
+	if transportConfiguration.MaxEarlyData == 0 {
+		conn, earlyReplyReader, err := dialer(nil)
+		if err != nil {
+			return nil, err
+		}
 		remoteAddr := conn.RemoteAddr()
-		earlyReplyReader := io.LimitReader(bufferedConn, int64(bufferedConn.Buffered()))
-		return newConnectionWithEarlyReply(conn, remoteAddr, earlyReplyReader), nil
+
+		return newConnectionWithPendingRead(conn, remoteAddr, earlyReplyReader), nil
 	}
-	return nil, newError("unrecognized reply")
+
+	return newConnectionWithDelayedDial(dialer), nil
 }
 
 func dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
diff --git a/transport/internet/httpupgrade/hub.go b/transport/internet/httpupgrade/hub.go
index ecbe441c1..a3989ca5a 100644
--- a/transport/internet/httpupgrade/hub.go
+++ b/transport/internet/httpupgrade/hub.go
@@ -2,7 +2,9 @@ package httpupgrade
 
 import (
 	"bufio"
+	"bytes"
 	"context"
+	"encoding/base64"
 	"net/http"
 	"strings"
 
@@ -13,6 +15,8 @@ import (
 )
 
 type server struct {
+	config *Config
+
 	addConn        internet.ConnHandler
 	innnerListener net.Listener
 }
@@ -52,6 +56,19 @@ func (s *server) Handle(conn net.Conn) (internet.Connection, error) {
 		_ = conn.Close()
 		return nil, err
 	}
+	if s.config.MaxEarlyData != 0 {
+		if s.config.EarlyDataHeaderName == "" {
+			return nil, newError("EarlyDataHeaderName is not set")
+		}
+		earlyData := req.Header.Get(s.config.EarlyDataHeaderName)
+		if earlyData != "" {
+			earlyDataBytes, err := base64.URLEncoding.DecodeString(earlyData)
+			if err != nil {
+				return nil, err
+			}
+			return newConnectionWithPendingRead(conn, conn.RemoteAddr(), bytes.NewReader(earlyDataBytes)), nil
+		}
+	}
 	return internet.Connection(conn), nil
 }
 
@@ -72,8 +89,7 @@ func (s *server) keepAccepting() {
 
 func listenHTTPUpgrade(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) {
 	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
-	_ = transportConfiguration
-	serverInstance := &server{addConn: addConn}
+	serverInstance := &server{config: transportConfiguration, addConn: addConn}
 
 	listener, err := transportcommon.ListenWithSecuritySettings(ctx, address, port, streamSettings)
 	if err != nil {