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Blank lines in Requests

Alvaro | Last updated: Nov 15, 2020 12:54PM UTC

There are exercises, for example "URL-based access control can be circumvented" in the "Access Control" lab, where you add a custom header to your requests to complete them. The requests themselves when passed through Burp show 2 blank lines at the end. If I add a custom header to one of those lines leaving only 1 blank line, it doesn't work. If I add the custom header before the blank lines and keep 2 blank lines, it works. I am curious, why do these matter when they are simply blank and at the very end?

Ben, PortSwigger Agent | Last updated: Nov 16, 2020 03:02PM UTC