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SockJS python server implementation on top of Tornado framework

Project description

SockJS-tornado is a Python server side counterpart of SockJS-client browser library running on top of Tornado framework.

Simplified echo SockJS server could look more or less like::

from tornado import web, ioloop from sockjs.tornado import SockJSRouter, SockJSConnection

class EchoConnection(SockJSConnection):
def on_message(self, msg):
if __name__ == ‘__main__’:

EchoRouter = SockJSRouter(EchoConnection, ‘/echo’)

app = web.Application(EchoRouter.urls) app.listen(9999) ioloop.IOLoop.instance().start()

(Take look at examples for a complete version).

Subscribe to SockJS mailing list for discussions and support.

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.


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

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


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)


app.listen(port, no_keep_alive=True)



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


  • XSS security fix for the HTMLFILE transport


  • Tornado 5.x compatibility fix


  • Tornado 4.x compatibility fix


  • Major version bump. sockjs-tornado can be considered mature
  • Python 3 support
  • Tornado 3.0 support on both Python 2 and Python 3
  • Bug fixes


  • iOS 6 support
  • SockJS 0.3.3 client support
  • Some headers and request URI path is now passed to on_open handler
  • Added binary transport support for raw websocket transport
  • Minor multiplex sample fixes


  • Added support for older simplejson library versions
  • Fixed installation script


  • SockJS 0.3 support
  • Connection multiplexing sample
  • IP validation is now optional


  • SockJS 0.2 support and compatibility fixes


Initial release.

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