When pulling from a non hg repository URL (e.g. http://www.kernel.org/hg) you geta pretty obscure error (zlib: uknown compression type). The attached patch modifies hgweb.py and hg.py to supply and check a 'Content-type: application/hg-0.1' HTTP header for the branches, between and changegroup commands, so that we know it's a proper hg repo before snarfing the input. Comments appreciated!

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#!/bin/sh -x

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hg init

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echo This is file a1 > a

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hg add a

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hg commit -m "commit #0" -d "0 0"

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touch b

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hg add b

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rm b

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hg commit -A -m"comment #1" -d "0 0"