diff --git a/common/buf/multi_buffer.go b/common/buf/multi_buffer.go
index a245123c..48cc185f 100644
--- a/common/buf/multi_buffer.go
+++ b/common/buf/multi_buffer.go
@@ -30,6 +30,26 @@ func ReadAllToMultiBuffer(reader io.Reader) (MultiBuffer, error) {
 	}
 }
 
+// ReadSizeToMultiBuffer reads specific number of bytes from reader into a MultiBuffer.
+func ReadSizeToMultiBuffer(reader io.Reader, size int32) (MultiBuffer, error) {
+	mb := NewMultiBufferCap(32)
+
+	for size > 0 {
+		bSize := size
+		if bSize > Size {
+			bSize = Size
+		}
+		b := NewSize(uint32(bSize))
+		if err := b.Reset(ReadFullFrom(reader, int(bSize))); err != nil {
+			mb.Release()
+			return nil, err
+		}
+		size -= bSize
+		mb.Append(b)
+	}
+	return mb, nil
+}
+
 // ReadAllToBytes reads all content from the reader into a byte array, until EOF.
 func ReadAllToBytes(reader io.Reader) ([]byte, error) {
 	mb, err := ReadAllToMultiBuffer(reader)
diff --git a/proxy/http/server.go b/proxy/http/server.go
index 2e939803..ec30bd11 100644
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -173,11 +173,11 @@ func (s *Server) handleConnect(ctx context.Context, request *http.Request, reade
 	}
 
 	if reader.Buffered() > 0 {
-		payload := buf.NewSize(uint32(reader.Buffered()))
-		common.Must(payload.Reset(func(b []byte) (int, error) {
-			return reader.Read(b[:reader.Buffered()])
-		}))
-		if err := ray.InboundInput().WriteMultiBuffer(buf.NewMultiBufferValue(payload)); err != nil {
+		payload, err := buf.ReadSizeToMultiBuffer(reader, int32(reader.Buffered()))
+		if err != nil {
+			return err
+		}
+		if err := ray.InboundInput().WriteMultiBuffer(payload); err != nil {
 			return err
 		}
 		reader = nil