Websockets in cmd line app

[Pete Marshall]

Hi,

  I'm looking at some Web Socket code.  The browser based example (thanks Seth)  works fine but when I transfer it across to a command line app (using dart:io) I get an error :  Socket closed HttpParserException: Connection closed before full header was received.

Note I'm not seeing the socket open output.

Is it expected that dart:io based websockets should be working? I'm on editor build 13393 and SDK 13387.

Thanks

Pete

initWebSocket() {

     socket = new WebSocket("ws://echo.websocket.org")

     ..onopen = () {;

       print("Socket open");

       connected = true;

       print(socket.readyState);

       socket.send("Hello from Dart");

     }

     ..onclose = (e) {

       print("Socket closed ${(e as CloseEvent).reason}");

       connected = false;

     }

     ..onerror = (e) {

       print("Socket error ${e}");

       connected = false;

     }

     ..onmessage  = (e) {

       print((e as MessageEvent).toString());

     };

   }

[Vadim Tsushko]

Hi, Pete

I have not much to say about this concrete error - but I use WebSocket server and clients, both browser based and console based in Objectory. So you may have a look at it for (hopefully) working example.

I've found debugging of WebSocket intercommunication not so easy yet. As I recollect on some step I saw exactly your error message, but cannot remember now what a situation it was and how I managed to work in out.

 

Best regards, Vadim Tsushko

[Søren Gjesse]

The problem is that when no path is specified in the URL then the path of the GET request wrongly becomes the empty string.

If you change:

  socket = new WebSocket("ws://echo.websocket.org")

to

  socket = new WebSocket("ws://echo.websocket.org/")

(adding the path /) the web socket connection is established.

I have opened http://code.google.com/p/dart/issues/detail?id=6185 on the issue.

Regards,

Søren

--
Consider asking HOWTO questions at Stack Overflow: http://stackoverflow.com/tags/dart
 
 

[Pete Marshall]

Thanks for spotting this, I just couldn't see what was wrong, I moved to a different bit of code and parked this one.

Pete

[Søren Gjesse]

The bug is fixed in https://code.google.com/p/dart/source/detail?r=13939.

Regards,

Søren