Is a workarround for dynamic IP ?

[Kroc]

My app try to connect itself on another web site (post credential and
read returned cookie). Then try to get a restricted page.

This work fine on my machine with SDK, unfortunatly, on app engine,
every request have a different IP addresse and the other web site
reject the second http request.

Is there any way to use URL fetching service from a single IP
addresse ? or can we use a proxy ?
Any other idea are welcome...

[nischalshetty]

There's nothing much you can do as far as IPs on appengine are concerned. A good idea is to have a proxy server set up on say aws and route your calls through that.