Wrong url scheme for WebSocket
javascript, playframework-2.0
Solution
A WebSocket needs `ws://` or `wss://` (for SSL) instead of `http://`.
However, the problem in your code is that the statement `@routes.Application.view(userName).webSocketURL()` apparently isn't replaced with some useful value but kept as-is. This is because your framework seems to consider assets completely static and thus ignores anything in there that would be a placeholder/variable in a normal template.
One possible solution for your problem would be keeping the URL in your template, e.g. by adding `data-ws="@....."` to your `<body>` tag and then use JavaScript to extract that attribute:
var socket = new WebSocket(document.body.getAttribute('data-ws'))
Problem
I have a websockets program in play 2.1, which works just fine and the template looks like this: ``` // Contents of the view.scala.html file @(userName: String)(implicit request: RequestHeader) @main("text") { <script type="text/javascript" charset="utf-8"> $(function() { var WS = window['MozWebSocket'] ? MozWebSocket : WebSocket; alert("before") var socket = new WS("@routes.Application.view(userName).webSocketURL()"); alert("after") socket.onmessage = function(event) { alert(event.data); }; }); </script> } ``` The issue is that as soon as I move my javascript into the `assets.javascripts` folder and change the `view.scala.html` file into the following it stops working. ``` // Contents of the view.scala.html file @(userName: String)(implicit request: RequestHeader) @main("text") { <script type="text/javascript" charset="utf-8" src="@routes.Assets.at("javascripts/viewer.min.js")"></script> } ``` Play finds the file, executes the javascript, I can see the popup triggered by the `alert("before")` line of code, but after that... nothing. This is the google chrome error I get in the console: ``` Wrong url scheme for WebSocket http://localhost:9000/@routes.Application.view(userName).webSocketURL() ``` What am I missing?