Stop Iteration Error

[mphilip9]

Recently, I saw this post saying that the gevent-websocket worker was not longer required when running the gunicorn server:

So I modified the start command for the gunicorn service to look like this

ExecStart=/home/ubuntu/briefcaseEnv/bin/gunicorn -k gevent -w 1 --bind 0.0.0.0:%i --log-level=warning wsgi:app

And everything seemed to run fine. But I noticed we are getting a very large number of these errors in Sentry since the change:

 def __call__(self, environ, start_response):
        self.ws = simple_websocket.Server(environ, **self.server_args)
        ret = self.app(self)
        if self.ws.mode == 'gunicorn':
            raise StopIteration()
        return ret

That StopIteration error is now being raised quite frequently.

What might be the cause of this error? Would this be due to changing the worker for the server? Should I change it back to use gevent-websocket?

[miguelgrinberg]

The gevent worker in Gunicorn has this problem, unfortunately. I explain what I know about this issue in this comment.

You can use gevent without Gunicorn to avoid this issue. Or else continue using gevent-websocket if you must use Gunicorn.

[mphilip9]

Thanks for the prompt reply. Will try using gevent without Gunicorn