ajjahn/rackproxy — pull request #1 by sidereel (2013-02-16 00:35:57+00:00)
Title: Make rack proxy forward all http headers to the backend server

We had to do this in order for Authorization headers to be forwarded on to the downstream server. Previously, only referrer was being forwarded. Now, any env key beginning with HTTP_ will be forwarded to the downstream server.