Django 1.9 changed the behavior of URL redirects to always make them

relative if pointing to the same host. In theory, this is against RFCs

and can break some HTTP implementations out there, but in practice the

only real problem for us is that it makes it much harder to write unit

tests that cover 1.9+ and pre-1.9 versions of Django.
This change introduces AbsoluteURLRedirectMiddleware, which will turn

those relative URLs back into absolute URLs, giving us the legacy

behavior. Sites/applications can use this until they're fully ready to

adopt the newer behavior of URL redirects.

Tested this with Review Board. Verified the URLs were coming back as

absolute in all cases.