Support cookie-based EZProxy setups

[dstillman]

It seems many EZProxy setups perform authentication on one domain and then use a cookie to track the session across one or more other domains. Perhaps this is a new version designed to work using wildcard DNS rather than non-standard ports?

An easy solution might be to keep track of the EZProxy part of the URL and automatically map other domains that contain it. Looking for the cookie might not even be necessary, though it'd prevent needing to search each URL for all the EZProxy substrings used in the current session.

[dstillman]

more headers

[dstillman]

Then again, while there are multiple domains involved in this second set of headers, from a quick glance it does look like it should work with the current system. Not sure why it's not, but perhaps there's some other issue as well. I'll try to get a bit more info.

He writes:

"In the normal version it works great, in the Harvard proxied version, I get the folder icon, but when I click on it I get a blank box in the bottom right (where the saving item dialog should appear) and no selection box for selecting which source I want to save."

[simon]

Merging this with #743, since, for the time being, it looks like we're going to resolve the two issues in a similar way. Also, we do now work with the Harvard proxied version, for whatever reason.