We're building a tunneling/proxy system and we were wondering if it is possible
to read all of a user's cookies so that we can put them in a proxied request.
Based off of our testing, it appears that request.getCookies() will only return
cookies set by our domain. Does that me we cannot read cookies set by Yahoo!
or Google (or any other domain for that matter)?

If so, how can we get access to those cookies?