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copied!<p>Sorry for the comment in the form of an answer, I can't comment yet...</p> <p>Are you setting Sec-WebSocket-Protocol header on the websocket Config? (<a href="https://code.google.com/p/go/source/browse/websocket/websocket.go?repo=net#74" rel="nofollow">https://code.google.com/p/go/source/browse/websocket/websocket.go?repo=net#74</a> and <a href="http://tools.ietf.org/html/rfc6455#page-59" rel="nofollow">http://tools.ietf.org/html/rfc6455#page-59</a>)</p> <p>That error message seems to crop up on Google many times relating to incompatibility or conflict with that header.</p> <p>Something like:</p> <pre><code>func wsHandler(webSck *websocket.Conn) { webSck.Config.Header.Add("Sec-WebSocket-Protocol", "chat") fmt.Fprint(webSck, "Rpy") fmt.Println("Sent \"Rpy\" to web socket", webSck) //more code here } </code></pre> <p>Also, I think it's preferred to use the Write function on the websocket (<a href="https://code.google.com/p/go/source/browse/websocket/websocket.go?repo=net#205" rel="nofollow">https://code.google.com/p/go/source/browse/websocket/websocket.go?repo=net#205</a>) as it encapsulates/converts the written data into frames.</p> <p>So more like:</p> <pre><code>func wsHandler(webSck *websocket.Conn) { webSck.Config.Header.Add("Sec-WebSocket-Protocol", "chat") _, _ = webSck.Write("Rpy") fmt.Println("Sent \"Rpy\" to web socket") //more code here } </code></pre> <p>But obviously checking the error from Write!</p> <p>Hope that helps.</p> <p>EDIT: Remove the extraneous ", webSck" from the fmt.Println .</p>

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