diff --git a/common/log/logger_test.go b/common/log/logger_test.go
index 1c7f06e2d438..6a664e08f646 100644
--- a/common/log/logger_test.go
+++ b/common/log/logger_test.go
@@ -16,6 +16,7 @@ func TestFileLogger(t *testing.T) {
 	common.Must(err)
 	path := f.Name()
 	common.Must(f.Close())
+	defer os.Remove(path)
 
 	creator, err := CreateFileLogWriter(path)
 	common.Must(err)
diff --git a/core/core.go b/core/core.go
index 93ca2d9c0145..dabdee9d7eb3 100644
--- a/core/core.go
+++ b/core/core.go
@@ -19,7 +19,7 @@ import (
 var (
 	Version_x byte = 24
 	Version_y byte = 11
-	Version_z byte = 11
+	Version_z byte = 21
 )
 
 var (
diff --git a/go.mod b/go.mod
index 8c96fd43332c..6bcd4403ec20 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/pires/go-proxyproto v0.8.0
 	github.com/quic-go/quic-go v0.46.0
 	github.com/refraction-networking/utls v1.6.7
-	github.com/sagernet/sing v0.5.0
+	github.com/sagernet/sing v0.5.1
 	github.com/sagernet/sing-shadowsocks v0.2.7
 	github.com/seiflotfy/cuckoofilter v0.0.0-20240715131351-a2f2c23f1771
 	github.com/stretchr/testify v1.9.0
@@ -26,7 +26,7 @@ require (
 	golang.org/x/sys v0.27.0
 	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
 	google.golang.org/grpc v1.67.1
-	google.golang.org/protobuf v1.35.1
+	google.golang.org/protobuf v1.35.2
 	h12.io/socks v1.0.3
 	lukechampine.com/blake3 v1.3.0
 )
diff --git a/go.sum b/go.sum
index 92764ddaf86b..c1e7dd4b598a 100644
--- a/go.sum
+++ b/go.sum
@@ -52,8 +52,8 @@ github.com/refraction-networking/utls v1.6.7 h1:zVJ7sP1dJx/WtVuITug3qYUq034cDq9B
 github.com/refraction-networking/utls v1.6.7/go.mod h1:BC3O4vQzye5hqpmDTWUqi4P5DDhzJfkV1tdqtawQIH0=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
-github.com/sagernet/sing v0.5.0 h1:soo2wVwLcieKWWKIksFNK6CCAojUgAppqQVwyRYGkEM=
-github.com/sagernet/sing v0.5.0/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.5.1 h1:mhL/MZVq0TjuvHcpYcFtmSD1BFOxZ/+8ofbNZcg1k1Y=
+github.com/sagernet/sing v0.5.1/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/sagernet/sing-shadowsocks v0.2.7 h1:zaopR1tbHEw5Nk6FAkM05wCslV6ahVegEZaKMv9ipx8=
 github.com/sagernet/sing-shadowsocks v0.2.7/go.mod h1:0rIKJZBR65Qi0zwdKezt4s57y/Tl1ofkaq6NlkzVuyE=
 github.com/seiflotfy/cuckoofilter v0.0.0-20240715131351-a2f2c23f1771 h1:emzAzMZ1L9iaKCTxdy3Em8Wv4ChIAGnfiz18Cda70g4=
@@ -120,8 +120,8 @@ google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 h1:
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
 google.golang.org/grpc v1.67.1 h1:zWnc1Vrcno+lHZCOofnIMvycFcc0QRGIzm9dhnDX68E=
 google.golang.org/grpc v1.67.1/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
-google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
-google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/infra/conf/common.go b/infra/conf/common.go
index ccd36d3d511f..fd6e732a3c62 100644
--- a/infra/conf/common.go
+++ b/infra/conf/common.go
@@ -42,6 +42,10 @@ type Address struct {
 	net.Address
 }
 
+func (v Address) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.Address.String())
+}
+
 func (v *Address) UnmarshalJSON(data []byte) error {
 	var rawStr string
 	if err := json.Unmarshal(data, &rawStr); err != nil {
diff --git a/infra/conf/transport_internet.go b/infra/conf/transport_internet.go
index c19fd6ca1d3d..6b236e2be0af 100644
--- a/infra/conf/transport_internet.go
+++ b/infra/conf/transport_internet.go
@@ -234,6 +234,7 @@ type SplitHTTPConfig struct {
 	DownloadSettings     *StreamConfig     `json:"downloadSettings"`
 	Mode                 string            `json:"mode"`
 	Extra                json.RawMessage   `json:"extra"`
+	NoGRPCHeader         bool              `json:"noGRPCHeader"`
 }
 
 type Xmux struct {
@@ -321,6 +322,7 @@ func (c *SplitHTTPConfig) Build() (proto.Message, error) {
 		XPaddingBytes:        splithttpNewRandRangeConfig(c.XPaddingBytes),
 		Xmux:                 &muxProtobuf,
 		Mode:                 c.Mode,
+		NoGRPCHeader:         c.NoGRPCHeader,
 	}
 	var err error
 	if c.DownloadSettings != nil {
diff --git a/transport/internet/http/config.go b/transport/internet/http/config.go
index 989ed1060b57..1cd7d05860b2 100644
--- a/transport/internet/http/config.go
+++ b/transport/internet/http/config.go
@@ -8,7 +8,7 @@ import (
 
 func (c *Config) getHosts() []string {
 	if len(c.Host) == 0 {
-		return []string{"www.example.com"}
+		return []string{""}
 	}
 	return c.Host
 }
diff --git a/transport/internet/http/dialer.go b/transport/internet/http/dialer.go
index d0a86e8b4eb2..42a9f9b3c1ea 100644
--- a/transport/internet/http/dialer.go
+++ b/transport/internet/http/dialer.go
@@ -215,9 +215,16 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 		}
 	}
 
+	Host := httpSettings.getRandomHost()
+	if Host == "" && net.ParseAddress(dest.NetAddr()).Family().IsDomain() {
+		Host = dest.Address.String()
+	} else if Host == "" {
+		Host = "www.example.com"
+	}
+
 	request := &http.Request{
 		Method: httpMethod,
-		Host:   httpSettings.getRandomHost(),
+		Host:   Host,
 		Body:   breader,
 		URL: &url.URL{
 			Scheme: "https",
diff --git a/transport/internet/splithttp/client.go b/transport/internet/splithttp/client.go
index e5866b55f444..77b88fa49dff 100644
--- a/transport/internet/splithttp/client.go
+++ b/transport/internet/splithttp/client.go
@@ -46,6 +46,9 @@ func (c *DefaultDialerClient) OpenUpload(ctx context.Context, baseURL string) io
 	reader, writer := io.Pipe()
 	req, _ := http.NewRequestWithContext(ctx, "POST", baseURL, reader)
 	req.Header = c.transportConfig.GetRequestHeader()
+	if !c.transportConfig.NoGRPCHeader {
+		req.Header.Set("Content-Type", "application/grpc")
+	}
 	go c.client.Do(req)
 	return writer
 }
diff --git a/transport/internet/splithttp/config.pb.go b/transport/internet/splithttp/config.pb.go
index f2d1ab4fdf80..0ab85fd91daf 100644
--- a/transport/internet/splithttp/config.pb.go
+++ b/transport/internet/splithttp/config.pb.go
@@ -37,6 +37,7 @@ type Config struct {
 	Xmux                 *Multiplexing          `protobuf:"bytes,9,opt,name=xmux,proto3" json:"xmux,omitempty"`
 	DownloadSettings     *internet.StreamConfig `protobuf:"bytes,10,opt,name=downloadSettings,proto3" json:"downloadSettings,omitempty"`
 	Mode                 string                 `protobuf:"bytes,11,opt,name=mode,proto3" json:"mode,omitempty"`
+	NoGRPCHeader         bool                   `protobuf:"varint,12,opt,name=noGRPCHeader,proto3" json:"noGRPCHeader,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -146,6 +147,13 @@ func (x *Config) GetMode() string {
 	return ""
 }
 
+func (x *Config) GetNoGRPCHeader() bool {
+	if x != nil {
+		return x.NoGRPCHeader
+	}
+	return false
+}
+
 type RandRangeConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -278,7 +286,7 @@ var file_transport_internet_splithttp_config_proto_rawDesc = []byte{
 	0x72, 0x6e, 0x65, 0x74, 0x2e, 0x73, 0x70, 0x6c, 0x69, 0x74, 0x68, 0x74, 0x74, 0x70, 0x1a, 0x1f,
 	0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e,
 	0x65, 0x74, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22,
-	0x96, 0x06, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f,
+	0xba, 0x06, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f,
 	0x73, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x12, 0x12,
 	0x0a, 0x04, 0x70, 0x61, 0x74, 0x68, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x70, 0x61,
 	0x74, 0x68, 0x12, 0x4d, 0x0a, 0x06, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72, 0x18, 0x03, 0x20, 0x03,
@@ -323,47 +331,50 @@ var file_transport_internet_splithttp_config_proto_rawDesc = []byte{
 	0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x53, 0x74, 0x72, 0x65, 0x61,
 	0x6d, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x10, 0x64, 0x6f, 0x77, 0x6e, 0x6c, 0x6f, 0x61,
 	0x64, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x12, 0x0a, 0x04, 0x6d, 0x6f, 0x64,
-	0x65, 0x18, 0x0b, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6d, 0x6f, 0x64, 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, 0x22, 0x35, 0x0a, 0x0f, 0x52, 0x61, 0x6e, 0x64,
-	0x52, 0x61, 0x6e, 0x67, 0x65, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x66,
-	0x72, 0x6f, 0x6d, 0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52, 0x04, 0x66, 0x72, 0x6f, 0x6d, 0x12,
-	0x0e, 0x0a, 0x02, 0x74, 0x6f, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x02, 0x74, 0x6f, 0x22,
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+	0x65, 0x18, 0x0b, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6d, 0x6f, 0x64, 0x65, 0x12, 0x22, 0x0a,
+	0x0c, 0x6e, 0x6f, 0x47, 0x52, 0x50, 0x43, 0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x18, 0x0c, 0x20,
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+	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,
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+	0x4c, 0x69, 0x66, 0x65, 0x74, 0x69, 0x6d, 0x65, 0x4d, 0x73, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0b,
 	0x32, 0x32, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72,
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/transport/internet/splithttp/config.proto b/transport/internet/splithttp/config.proto
index b589462053c4..f6b101643de4 100644
--- a/transport/internet/splithttp/config.proto
+++ b/transport/internet/splithttp/config.proto
@@ -20,6 +20,7 @@ message Config {
   Multiplexing xmux = 9;
   xray.transport.internet.StreamConfig downloadSettings = 10;
   string mode = 11;
+  bool noGRPCHeader = 12;
 }
 
 message RandRangeConfig {
diff --git a/transport/internet/splithttp/dialer.go b/transport/internet/splithttp/dialer.go
index d2e89eb43bdf..6a4484de8073 100644
--- a/transport/internet/splithttp/dialer.go
+++ b/transport/internet/splithttp/dialer.go
@@ -312,9 +312,13 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 	}
 
 	mode := transportConfiguration.Mode
-	if mode == "auto" && realityConfig != nil {
-		mode = "stream-up"
+	if mode == "auto" {
+		mode = "packet-up"
+		if (tlsConfig != nil && len(tlsConfig.NextProtocol) != 1) || realityConfig != nil {
+			mode = "stream-up"
+		}
 	}
+	errors.LogInfo(ctx, "XHTTP is using mode: "+mode)
 	if mode == "stream-up" {
 		conn.writer = httpClient.OpenUpload(ctx, requestURL.String())
 		return stat.Connection(&conn), nil
diff --git a/transport/internet/splithttp/splithttp_test.go b/transport/internet/splithttp/splithttp_test.go
index b01727e03412..c349f8f5df60 100644
--- a/transport/internet/splithttp/splithttp_test.go
+++ b/transport/internet/splithttp/splithttp_test.go
@@ -424,8 +424,8 @@ func Test_maxUpload(t *testing.T) {
 		ProtocolSettings: &Config{
 			Path: "/sh",
 			ScMaxEachPostBytes: &RandRangeConfig{
-				From: 100,
-				To:   100,
+				From: 10000,
+				To:   10000,
 			},
 		},
 	}
@@ -434,7 +434,7 @@ func Test_maxUpload(t *testing.T) {
 	listen, err := ListenSH(context.Background(), net.LocalHostIP, listenPort, streamSettings, func(conn stat.Connection) {
 		go func(c stat.Connection) {
 			defer c.Close()
-			var b [1024]byte
+			var b [10240]byte
 			c.SetReadDeadline(time.Now().Add(2 * time.Second))
 			n, err := c.Read(b[:])
 			if err != nil {
@@ -452,11 +452,11 @@ func Test_maxUpload(t *testing.T) {
 	conn, err := Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), listenPort), streamSettings)
 
 	// send a slightly too large upload
-	var upload [101]byte
+	var upload [10001]byte
 	_, err = conn.Write(upload[:])
 	common.Must(err)
 
-	var b [1024]byte
+	var b [10240]byte
 	n, _ := io.ReadFull(conn, b[:])
 	fmt.Println("string is", n)
 	if string(b[:n]) != "Response" {
@@ -464,7 +464,7 @@ func Test_maxUpload(t *testing.T) {
 	}
 	common.Must(conn.Close())
 
-	if uploadSize > 100 || uploadSize == 0 {
+	if uploadSize > 10000 || uploadSize == 0 {
 		t.Error("incorrect upload size: ", uploadSize)
 	}