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Embedded browser - 503 Service Temporarily Unavailable

Narendra | Last updated: Mar 23, 2021 06:04PM UTC

Hello, I am trying to use embedded browser with https://gitlab.com/users/sign_in but it keeps refreshing with "HTTP/1.1 503 Service Temporarily Unavailable" warning. I can access same URL with regular chrome. Do I need to configure additional options?

Uthman, PortSwigger Agent | Last updated: Mar 24, 2021 10:14AM UTC

Hi Narendra,

Thanks for reporting this.

We use the same process and command-line flags to start the browser for proxying and crawling. As a result of some of the flags we use, the browser believes it is being controlled by automation, and certain frameworks (e.g. fingerprint.js, Cloudflare) reject the browser because of this.

We would recommend using an external browser with Burp as a workaround for this specific site (and sites like it).

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