Rails 5 WebSockets “Request origin not allowed” [Solution]

Since I have spent about 15 minutes today trying to figure out why my WebSockets are not updating in development, I have decided to put quick fix here, hopefully this will be useful.


Anatoly Spektor

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When I started ActionCable I got this error:

Request origin not allowed:
Failed to upgrade to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Finished "/cable/" [WebSocket] for at 2016-08-01 14:23:38 -0700


  1.  Go to
  2.  Add following line:
    config.action_cable.allowed_request_origins = ['']
  3. Restart Web Server
  4. Enjoy!

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Anatoly Spektor

IT Consultant with 6 years experience in Software Development and IT Leadership. Participated in such projects as Eclipse IDE, Big Blue Button, Toronto 2015 Panam Games.

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  1. […] have create separate post how to resolve it ,but for your convenience, I will repeat it […]

  2. Bruno Wego

    Thank you very much, exactly what I needed.

  3. Michal

    Great Job. You just saved my time 🙂