Hi all,
I'm working on a python application with WebSockets and AppEngine Flexible.
I did my latest deployment on the 11th may and it's working.

Yesterday I tried to deploy again with exactly the same code and now I'm 
getting this error:

Traceback (most recent call last): File 
"/env/lib/python3.6/site-packages/gevent/pywsgi.py", line 999, in 
handle_one_response self.run_application() File 
"/env/lib/python3.6/site-packages/geventwebsocket/handler.py", line 75, in 
run_application self.run_websocket() File 
"/env/lib/python3.6/site-packages/geventwebsocket/handler.py", line 52, in 
run_websocket list(self.application(self.environ, lambda s, h, e=None: [])) 
File "/env/lib/python3.6/site-packages/flask/app.py", line 2464, in 
__call__ return self.wsgi_app(environ, start_response) File 
"/env/lib/python3.6/site-packages/flask_sockets.py", line 40, in __call__ 
handler, values = adapter.match() File 
"/env/lib/python3.6/site-packages/werkzeug/routing.py", line 2026, in match 
raise WebsocketMismatch() werkzeug.routing.WebsocketMismatch: 400 Bad 
Request: The browser (or proxy) sent a request that this server could not 
understand.

I also found another user who had a similar problem 2 days 
ago: https://serverfault.com/questions/1063604/websockets-flexible-app-engine

This leads me to think it's caused by some change in the App Engine 
Environment.
Does anyone have some insight?

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  • [google-appengine... Giulio Gialanella

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