Integrating Socket.io in a Docker-Compose Stack with Node and Angular

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If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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The Problem

The logs suggested that everything was functioning normally (HTTP status code 200), but real-time messages were not being received. This situation is frustrating, especially when debugging yields no explicit error messages.

Solution

Update the Frontend Configuration

Specify URL Protocol: The ngx-socket-io library requires the URL to be specified with the http or https protocol. Instead of just using a relative path, you must provide the full URL. Update your SocketIoConfig as follows:

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Update the Backend Configuration

[[See Video to Reveal this Text or Code Snippet]]

Troubleshooting Tips

Inspect Network Console: If things still seem amiss, make sure to check the network console in Chrome (or any browser). Look for errors related to "wrong namespace" which might help you identify configuration mishaps.

Check CORS Configuration: Ensure that your CORS policy allows requests from your frontend to access the backend’s endpoints.

Docker Configuration

Your Docker and Nginx configurations should look as follows:

Dockerfile for Backend

Ensure your Dockerfile is set up properly to expose both the application and socket ports:

[[See Video to Reveal this Text or Code Snippet]]

Nginx Configuration

Update Nginx to correctly proxy WebSocket connections:

[[See Video to Reveal this Text or Code Snippet]]

Docker-Compose Configuration

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

If you run into trouble, remember to check both your console logs and the network traffic through your browser's developer tools to identify any potential issues. Happy coding!