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Custom crawl user-agent cannot contain colon (Burp

Herman Stevens 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.



Mike Eaton Aug 28, 2019 01:55PM UTC Support Center agent

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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