How to block Websocket protocol (to simulate corporate firewalls) on Ubuntu?

Question

I am working on a web app that uses WebSockets, and I know that many corporate firewalls block it. Now I have added Socket.io to fallback to XHR polling in case Websockets are blocked.

But I can't figure out how to simulate this environment for testing. How can I simulate an environment similar to corporate firewalls?

I am on Ubuntu 12.04, but can switch to Windows 7 if required. Am open to any different approaches as well.

So I would simply run the app on an emulator and block the actual ports on my PC to simulate that environment on Ubuntu - sudo ufw enable - sudo ufw reject out {PORT} — 130nk3r5, Nov 28 '19 at 14:38

score 2 · Answer 1 · answered Dec 13 '14 at 03:35

2

install squid and tell your browser to use it as a proxy.

answered Dec 13 '14 at 03:35

Jasen

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squid sqid doesn't proxy websocket. so websocket will be blocked. – Jasen Nov 28 '19 at 07:03

score 2 · Answer 2 · answered Feb 10 '17 at 22:15

2

I was able to get socket.io to error on websocket connect using Fiddler. In Filters, I set Delete response headers to delete the header Connection: Upgrade.

answered Feb 10 '17 at 22:15

frodo2975

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How to block Websocket protocol (to simulate corporate firewalls) on Ubuntu?

2 Answers2