Use httpconnection even with proxies. This should give us HTTP keepalive when we talk to proxies and should allow us to stream a file in unbundle (instead of reading everything into a string). This should fix issue376.

#!/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