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localhost - worker process - not in burp - MAC OS

Eric | Last updated: Jul 04, 2019 04:50PM UTC

I currently use Chrome with SwitchySharp extension for Proxy or firefox with proxysetting into firefox. Everytime I try to catch traffic comming from localhost, it does not work. I must add an host to my etc/host to test with another adress for example http://webgoat . (relyied to 127.0.0.1). I found that tricks so I was happy. BUT ! Now, I must test a webSite who use WorkerProcess to make backendCall, those call isn't into burp HTTP History even if I see those into network tab into chrome / firefox debugging tool. For example : This request is in BURP : Request URL: https://*****/price Request Method: OPTIONS Status Code: 204 No Content Remote Address: 127.0.0.1:8083 Referrer Policy: no-referrer-when-downgrade THis request IS NOT into BURP Request URL: https://*****/price Request Method: POST Status Code: 200 OK (from ServiceWorker) Referrer Policy: no-referrer-when-downgrade Could you help me please ? I'm On this trouble for 2 days now. :-(

Liam, PortSwigger Agent | Last updated: Jul 05, 2019 10:32AM UTC

Is this a non-proxy aware client? Burp's support for invisible proxying allows non-proxy-aware clients to connect directly to a Proxy listener. This option is sometimes useful if the application you are targeting employs a thick client component that runs outside of the browser, or a browser plugin that makes its own HTTP requests outside of the browser's framework. - https://portswigger.net/burp/documentation/desktop/tools/proxy/options/invisible

Burp User | Last updated: Jul 09, 2019 06:25PM UTC

I see all the call from the browser (chrome) it's look alike everything happen into browser... I dont know why but even if I try this call sequence 200 times, I always only see OPTION request in BURP and I never see the POST request. This is not the only site that I get the problem... Often when a WorkerProcess make the call, I see nothing into my http history.

Burp User | Last updated: Jul 09, 2019 07:57PM UTC

And If you have an hint for my localhost... On macOS, I never see trafic from localhost when testing on my Mac.

Liam, PortSwigger Agent | Last updated: Jul 10, 2019 08:06AM UTC