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
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
ls
echo This is file b1 > b
hg add b
hg commit -m "commit #1" -d "1000000 0"
hg co 0
# B should disappear
ls