rackerlabs/repose — pull request #1210 by InblEric (2014-12-31 17:30:12+00:00)
Title: Rep 1527 - Forwarded Proto Header Filter

From the acceptance criteria:

X-FORWARDED-PROTO: http
X-FORWARDED-PROTO: https

Looks like http actually comes in as HTTP/1.1 but I don't think this should be a problem as long as whoever uses the filter knows what they're looking for. I assume https would come in as HTTPS but I'm not entirely sure.