SockJS-tornado API

SockJS provides slightly different API than tornado.websocket. Main differences are:

1. Depending on transport, actual client connection might or might not be there. So, there is no _self.request_ and

   other tornado.web.RequestHandler properties.

2. Changed open callback name to on_open to be more consistent with other callbacks.

3. Instead of write_message, all messages are sent using send method. Just in case, send in tornado.web.RequestHandler

   sends raw data over the connection, without encoding it.

4. There is handy broadcast function, which accepts list (or iterator) of clients and message to send.

Settings

You can pass various settings to the SockJSRouter, in a dictionary:

MyRouter = SockJSRouter(MyConnection, '/my', dict(disabled_transports=['websocket']))

Deployment

sockjs-tornado properly works behind haproxy and it is recommended deployment approach.

Sample configuration file can be found here.

If your log is full of “WARNING: Connection closed by the client”, pass no_keep_alive as True to HTTPServer constructor:

HTTPServer(app, no_keep_alive=True).listen(port)

or:

app.listen(port, no_keep_alive=True)

Changelog

1.0.7

• Tornado 6.x compatibility fix. Minimum supported Tornado version is 4.x now.

• XSS fix

1.0.6

• XSS security fix for the HTMLFILE transport