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replace text in websocket operations

Dave | Last updated: Apr 01, 2015 12:38AM UTC

I want to match and replace text in (outgoing) websockets. But it seems that match-and-replace only works on HTTP, not WebSockets. How can I edit WebSockets? Is there a way to do it with Burp that I haven't noticed? Failing that, what would I need to do to make it happen on my own?

PortSwigger Agent | Last updated: Apr 01, 2015 11:29AM UTC

You can't currently configure match/replace rules for WebSockets messages, sorry. But if you enable Proxy interception of WebSockets messages (at Proxy / Options / Intercept WebSockets Messages), then you can edit them as normal in the Intercept window.

Burp User | Last updated: Apr 01, 2015 01:58PM UTC

Could I write a plugin/extension, or does the API not allow for that?

PortSwigger Agent | Last updated: Apr 01, 2015 02:01PM UTC

Sorry, no, the API doesn't currently expose WebSockets messages.

Burp User | Last updated: Apr 14, 2015 01:50PM UTC

Dave, You can check out an extension that I wrote last year: just google on burp+websocket+extension. Part of the provided functionality is to use a custom filter class that is applied to intercepted websocket messages: basically you can select which messages to process and how to modify them. Source code for the extension is provided as well. Enjoy.

Faisal | Last updated: Jul 11, 2022 05:26PM UTC

is there any chance to add this option ?

Hannah, PortSwigger Agent | Last updated: Jul 12, 2022 08:15AM UTC