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Can't read Websocket traffic using Fiddler classic

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ed
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ed asked on 21 Apr 2021, 08:26 AM

Hello,

Is it possible to capture localhost (client and server) websockets communication?In my case, in the client side I am using javascript code to connect to the websocket server, that it is started using java language.

In fiddler I do not see anything...

 

Regards,

Ed

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Rosen Vladimirov
Telerik team
answered on 23 Apr 2021, 01:11 PM

Hello Ed,

Yes, it is possible to capture websocket traffic with Fiddler Classic. I've attached a screenshot of the product where you can see the websocket communication between a Node.js server running on the localhost and a local webpage opened in the browser. In order to see the websocket traffic, you must ensure the requests sending from your client app respects the proxy set by Fiddler Classic. After that, just locate the request marked with the small WebSocket icon and double-click it.

Hope this helps.

Regards,
Rosen Vladimirov
Progress Telerik

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Rosen Vladimirov
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