This middleware is supposed to be placed in front of any WSGI
application. It will translate the WSGI environment to an environment
mimicking the environment of the reverse proxy placed in front of it.
It supports translating:
- Protocol via X-Forwarded-Proto
- Host via X-Forwarded-Host
- Prefix via X-Forwarded-Prefix (not standard, but already used in other
projects)
- Forwarded header (RFC7239)
Change-Id: I9e66e17a343fc454016415375bcd5a1285334f5a
89b11a1c73