Why Your Unity WebGL Multiplayer Breaks on Some Networks

WebGL multiplayer issues can be quite frustrating due to the variety of environments and network conditions players might encounter. Based on your detailed breakdown, here are some key takeaways and steps for troubleshooting WebGL multiplayer problems:

Common Issues and Symptoms

1. WebSocket Blocked by Proxy

   • Symptom: Works locally but fails elsewhere.
   • Cause: Network proxies or firewalls blocking WebSocket connections.
   • Check:
     • Ensure the server returns 200 OK with Access-Control-Allow-Origin in response to an OPTIONS preflight request.
     • Verify that WebSocket connections return a 101 Switching Protocols status code instead of 200.

2. CORS Issues

   • Symptom: Works standalone but fails when loaded from the browser.
   • Cause: Missing or incorrect CORS settings on the server.
   • Check:
     • Ensure your server has appropriate Access-Control-Allow-Origin headers set to match the page origin.

3. Mixed Content

   • Symptom: Works over HTTP but fails over HTTPS.
   • Cause: Using a WebSocket URL (ws://) instead of wss://.
   • **Check:

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