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Custom crawl user-agent cannot contain colon (Burp 2.1.0.3)

Herman | Last updated: Aug 24, 2019 08:27AM UTC

I am setting up a custom crawler function, and tried to set-up a user-agent like this: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0 However, this does not succeed and gives the error-message: "custom user-agent cannot contain colon" Is there any reason for this? Many WAFs try to block scans with user-agents that are know to be used from scanners. I would like to have all options open to block this (simple) defense. Thanks, Herman

Mike, PortSwigger Agent | Last updated: Aug 27, 2019 09:17AM UTC

Hi Herman, can you clarify what you mean by a custom crawler function? And is this error appearing in the error log or is this being returned in the response?

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