Error when copying from client to backend: websocket: close 1006 (abnormal closure): unexpected EOF

[Haomeng]

I just encountered below error message, looks like the wss connection is closed after dial successfully:

2020/10/19 17:25:43 websocketproxy: Error when copying from client to backend: websocket: close 1006 (abnormal closure): unexpected EOF
2020/10/19 17:25:43 http: response.WriteHeader on hijacked connection from huayun.com/haihe/bare-metal-vnc/src/websocketproxy.(*WebsocketProxy).ServeHTTP.func1 (websocket_proxy.go:130)

Note:
connBackend, resp, err := dialer.Dial(backend.Url.String(), requestHeader)
This line works fine, err is nil.

So any ideas, thans a lot!

[alfrye]

I am experiencing the same issues. Are there any updates on this issue?

[feiyiban]

I am experiencing the same issues. Are there any updates on this issue?

[mpisat]

Same here...

[Egr711]

In my case, needed to copy response headers after dialing.

        # websocketproxy.go
        connBackend, resp, err := dialer.Dial(backendURL.String(), requestHeader)
	if err = wsCopyResponse(resp, respBackend); err != nil {
		errorF(w.option.logger, "websocketproxy: couldn't copy response: %v", err)
	}

[lekhanhtoan37]

The issue still occurs after running it several times.

[Egr711]

if youre using net/http you can just use httputil.NewSingleHostReverseProxy instead of this package. websocket support was added in 2019 with Go 1.12