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2. Add support for Protocol-relative redirects (//uri).

RIghteo. I haven't found any references to this. Do you have a reference to the RFC for this? And possibly some real world examples?

Is it as simple as using "//forums.mirc.com/ubbthreads.php/forum_summary method post" as the new URL?

Tested this with the example script you provided and it seemed to work.