Don't send any request when client or target server closes connection.

net/vmess/vmessin.go

@@ -77,24 +77,18 @@ func (handler *VMessInboundHandler) HandleConnection(connection net.Conn) error
 	if err != nil {
 		return log.Error("Failed to create encrypt writer: %v", err)
 	}
-	//responseWriter.Write(response[:])
 
 	// Optimize for small response packet
 	buffer := make([]byte, 0, 1024)
 	buffer = append(buffer, response[:]...)
-	data, open := <-output
-	if open {
+	
+	if data, open := <-output; open {
 		buffer = append(buffer, data...)
+    responseWriter.Write(buffer)
+    go handleOutput(request, responseWriter, output, writeFinish)
+    <-writeFinish
 	}
-	responseWriter.Write(buffer)
-
-	if open {
-		go handleOutput(request, responseWriter, output, writeFinish)
-	} else {
-		close(writeFinish)
-	}
-
-	<-writeFinish
+	
 	if tcpConn, ok := connection.(*net.TCPConn); ok {
 		log.Debug("VMessIn closing write")
 		tcpConn.CloseWrite()

net/vmess/vmessout.go

@@ -108,23 +108,20 @@ func handleRequest(conn *net.TCPConn, request *vmessio.VMessRequest, input <-cha
 	if err != nil {
 		log.Error("VMessOut: Failed to serialize VMess request: %v", err)
 	}
-	//conn.Write(buffer)
-	data, open := <-input
+
+  // Send first packet of payload together with request, in favor of small requests.
+	payload, open := <-input
 	if open {
-		encryptRequestWriter.Crypt(data)
-		buffer = append(buffer, data...)
+		encryptRequestWriter.Crypt(payload)
+		buffer = append(buffer, payload...)
+    
+    _, err = conn.Write(buffer)
+    if err != nil {
+      log.Error("VMessOut: Failed to write VMess request: %v", err)
+    }
+    
+    v2net.ChanToWriter(encryptRequestWriter, input)
 	}
-
-	_, err = conn.Write(buffer)
-	if err != nil {
-		log.Error("VMessOut: Failed to write VMess request: %v", err)
-	}
-
-	if !open {
-		return nil
-	}
-
-	v2net.ChanToWriter(encryptRequestWriter, input)
 	return nil
 }