On 2021/04/27 16:23, Raymond E. Pasco wrote: > On Tue Apr 27, 2021 at 3:40 PM EDT, Stuart Henderson wrote: > > How does this work with other web servers? For example, I don't see the > > string X-Forwarded-Proto in nginx or Apache httpd (and the use of other > > X-Forwarded headers in them are only for adding to requests when running > > as a proxy itself, or picking up the client IP from headers rather than > > TCP). > > I think this header is usually set by administrators in a configuration > file, at least for nginx; something that aims to be more out-of-the-box > like Caddy sets it automatically. > > My understanding is that common reverse proxies can be told to rewrite > the Location header in this and similar cases, but I haven't looked > closely at it. >
It's the other way round, this (or proto= in the newer standardised Forwarded header) would be set by a reverse proxy to indicate the protocol that the client request came in on so that something running on the webserver could react accordingly (either in URL construction or to issue a redirect to https if wanted).
