title: Local Runtime 404 GET
body: <p>I am trying to get google collab local runtime working, but when I try to connect to the local server I get:</p>
  
  <pre><code>[I 10:17:23.142 NotebookApp] Serving notebooks from local directory: /home/adam/Documents/PYTHON/Complexity_Challenge/Spring_2018
  [I 10:17:23.142 NotebookApp] 0 active kernels
  [I 10:17:23.142 NotebookApp] The Jupyter Notebook is running at:
  [I 10:17:23.142 NotebookApp] http://localhost:8891/
  [I 10:17:23.142 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
  [W 10:17:33.609 NotebookApp] 404 GET /http_over_websocket (127.0.0.1) 50.27ms referer=None
  </code></pre>
  
  <p>The 404 GET is on the last line. I changed the setting in  the jupyter_notebook_config.py as dictated in <a href="https://research.google.com/colaboratory/local-runtimes.html" rel="nofollow noreferrer">https://research.google.com/colaboratory/local-runtimes.html</a></p>
  
  <p>EDIT: after Bob's comments I installed the package and then opened a notebook and tried to connect. It still didn't work but the error message is different:</p>
  
  <pre><code>(python3) adam@Rilke ~/Documents/DATA/terry20180313 $ jupyter serverextension enable --py jupyter_http_over_ws
  Enabling: jupyter_http_over_ws
  - Writing config: /home/adam/.jupyter
      - Validating...
        jupyter_http_over_ws  OK
  (python3) adam@Rilke ~/Documents/DATA/terry20180313 $ 
  (python3) adam@Rilke ~/Documents/DATA/terry20180313 $ jupyter notebook
  [I 12:58:33.319 NotebookApp] The port 8888 is already in use, trying another port.
  [I 12:58:33.320 NotebookApp] The port 8889 is already in use, trying another port.
  [I 12:58:33.320 NotebookApp] The port 8890 is already in use, trying another port.
  [I 12:58:33.321 NotebookApp] The port 8891 is already in use, trying another port.
  jupyter_http_over_ws extension initialized. Listening on /http_over_websocket
  [I 12:58:33.341 NotebookApp] Serving notebooks from local directory: /home/adam/Documents/DATA/terry20180313
  [I 12:58:33.341 NotebookApp] 0 active kernels
  [I 12:58:33.341 NotebookApp] The Jupyter Notebook is running at:
  [I 12:58:33.341 NotebookApp] http://localhost:8892/
  [I 12:58:33.341 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
  [E 12:59:19.470 NotebookApp] Uncaught exception
      Traceback (most recent call last):
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/http1connection.py", line 238, in _read_message
          delegate.finish()
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/httpserver.py", line 289, in finish
          self.delegate.finish()
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/web.py", line 2047, in finish
          self.execute()
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/web.py", line 2067, in execute
          **self.handler_kwargs)
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/jupyter_http_over_ws/handlers.py", line 43, in __init__
          websocket.WebSocketHandler.__init__(self, *args, **kwargs)
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/websocket.py", line 127, in __init__
          super(WebSocketHandler, self).__init__(application, request, **kwargs)
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/web.py", line 185, in __init__
          self.clear()
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/web.py", line 289, in clear
          self.set_default_headers()
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/notebook/base/handlers.py", line 316, in set_default_headers
          self.set_header("Access-Control-Allow-Origin", self.allow_origin)
        File "/home/adam/anaconda2/envs/python3/lib/python3.4/site-packages/tornado/websocket.py", line 385, in _disallow_for_websocket
          if self.stream is None:
      AttributeError: 'HttpOverWebSocketHandler' object has no attribute 'stream'
  </code></pre>