我在使用贵项目做socket5代理支持FTP传输时发现，底层使用TCP协议可以通，但是KCP协议出现WARN handshake fail, ERR: new methods request fail, ERR: timeout，希望解决这个问题

I discovered that the underlying TCP protocol works, but the KCP protocol does not, and I hope to fix this problem when using your project to support FTP transmission as a socket5 proxy.