title: Google appengine using appcfg from behind proxy with authentication
body: <p>Im working behind a corporate proxy and was fine while i was using the eclipse plugin configured with my proxy credentials. Then one of my deployments failed and now I have to rollback my previous transaction. Im trying to use appcfg (either .py or .cmd) since I think that is the only way to rollback. Im getting either timouts or proxy authentication errors when i set the proxy. setting an environment variable to http_proxy=<a href="http://user:pass@proxy.com" rel="nofollow noreferrer">http://user:pass@proxy.com</a> doesnt seem to work. also im on windows xp.</p>
  
  <p>does anyone have any ideas as to how to rollback without using appcfg or how to set appcfg to use a proxy with authentication?</p>