diff --git a/proxy/http/server.go b/proxy/http/server.go
index cfe524292..a144dd0e8 100644
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -87,10 +87,11 @@ func parseBasicAuth(auth string) (username, password string, ok bool) {
 }
 
 func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
-	reader := bufio.NewReaderSize(conn, 2048)
-
 Start:
-	conn.SetReadDeadline(time.Now().Add(time.Second * 16))
+	reader := bufio.NewReaderSize(conn, buf.Size)
+	if err := conn.SetReadDeadline(time.Now().Add(time.Second * 16)); err != nil {
+		return newError("unable to set read deadtime").Base(err)
+	}
 
 	request, err := http.ReadRequest(reader)
 	if err != nil {
@@ -110,7 +111,9 @@ Start:
 	}
 
 	log.Trace(newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]"))
-	conn.SetReadDeadline(time.Time{})
+	if err := conn.SetReadDeadline(time.Time{}); err != nil {
+		log.Trace(newError("unable to set back read deadline").Base(err))
+	}
 
 	defaultPort := net.Port(80)
 	if strings.ToLower(request.URL.Scheme) == "https" {
@@ -126,13 +129,23 @@ Start:
 	}
 	log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
 
+	// Get rid of bufio.Reader.
+	var firstPayload *buf.Buffer
+	if reader.Buffered() > 0 {
+		firstPayload = buf.New()
+		common.Must(firstPayload.Reset(func(b []byte) (int, error) {
+			return reader.Read(b[:reader.Buffered()])
+		}))
+	}
+	reader = nil
+
 	if strings.ToUpper(request.Method) == "CONNECT" {
-		return s.handleConnect(ctx, request, reader, conn, dest, dispatcher)
+		return s.handleConnect(ctx, request, firstPayload, conn, conn, dest, dispatcher)
 	}
 
 	keepAlive := (strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive")
 
-	err = s.handlePlainHTTP(ctx, request, reader, conn, dest, dispatcher)
+	err = s.handlePlainHTTP(ctx, request, firstPayload, conn, conn, dest, dispatcher)
 	if err == errWaitAnother {
 		if keepAlive {
 			goto Start
@@ -143,7 +156,7 @@ Start:
 	return err
 }
 
-func (s *Server) handleConnect(ctx context.Context, request *http.Request, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error {
+func (s *Server) handleConnect(ctx context.Context, request *http.Request, payload *buf.Buffer, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error {
 	_, err := writer.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
 	if err != nil {
 		return newError("failed to write back OK response").Base(err)
@@ -160,14 +173,17 @@ func (s *Server) handleConnect(ctx context.Context, request *http.Request, reade
 		return err
 	}
 
+	if !payload.IsEmpty() {
+		if err := ray.InboundInput().WriteMultiBuffer(buf.NewMultiBufferValue(payload)); err != nil {
+			return err
+		}
+	}
+
 	requestDone := signal.ExecuteAsync(func() error {
 		defer ray.InboundInput().Close()
 
 		v2reader := buf.NewReader(reader)
-		if err := buf.Copy(v2reader, ray.InboundInput(), buf.UpdateActivity(timer)); err != nil {
-			return err
-		}
-		return nil
+		return buf.Copy(v2reader, ray.InboundInput(), buf.UpdateActivity(timer))
 	})
 
 	responseDone := signal.ExecuteAsync(func() error {
@@ -219,7 +235,7 @@ func StripHopByHopHeaders(header http.Header) {
 
 var errWaitAnother = newError("keep alive")
 
-func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error {
+func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, payload *buf.Buffer, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error {
 	if !s.config.AllowTransparent && len(request.URL.Host) <= 0 {
 		// RFC 2068 (HTTP/1.1) requires URL to be absolute URL in HTTP proxy.
 		response := &http.Response{
@@ -251,6 +267,12 @@ func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, rea
 	output := ray.InboundOutput()
 	defer input.Close()
 
+	if !payload.IsEmpty() {
+		if err := input.WriteMultiBuffer(buf.NewMultiBufferValue(payload)); err != nil {
+			return err
+		}
+	}
+
 	var result error = errWaitAnother
 
 	requestDone := signal.ExecuteAsync(func() error {