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    <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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    1. POWebsocket output received by browser, complains about "Invalid UTF-8 sequence in header value "
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    1. USIntermernet
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    1. CO`fmt.Fprint` will also use `webSck.Write`, so when it comes to websocket frames that doesn't matter. But true that the possible error returned should be checked.
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    2. COGood point ANisus, Love those Go interfaces!
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    3. CO@Intermernet Thanks for the answer - this didn't work, I'll update my question to show the version that I have tried. websocket.Conn.config is private, and you need to use the accessor websocket.Conn.Config() to get at it. Additonally, for some reason the value of the header is by default nil, so I had to assign it a value.
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