httprepo: record the url after a request, makes pull + redirect works POST+redirect doesn't work in python, as a workaround we record the url from the previous GETs so that when we do a POST it uses the redirected url fix issue327

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "1000000 0"

echo 123 > b
hg add b
hg diff --nodates

hg diff --nodates -r tip

echo foo > a
hg diff --nodates