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I often deal with WebSocket failures, and debugging fixes is hard because I have not found a good way to simulate them. A lot of Linux tools are no longer available because macOS has now transitioned into using pf (the way I understand it; I'm a beginner at all this).

I've tried the native firewall, which doesn't seem to have enough control to block browser WebSockets only, and murus, which can probably do the trick, but I haven't been able to.

Are there any known ways to simulate WebSocket failures in a browser in order to debug fallbacks, etc?

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    Have a look at burp suite: portswigger.net/burp/communitydownload It can do several things, but I am not sure if it's the right tool.
    – davidbaumann
    Nov 12, 2019 at 16:54
  • Thanks! I'll check it out
    – jorgen
    Nov 12, 2019 at 19:06
  • @davidbaumann That worked! If you want to write it up as an answer I'll accept.
    – jorgen
    Nov 13, 2019 at 16:05

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Burp suite is the ultimate proxy to intercept and manipulate any connection that can use a proxy (socks/http/https...).

Burp suite

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