mod_proxy should send the X-Forwarded-Host header to the proxied server
Apache's mod_proxy adds a X-Forwarded-Host header when it makes a request to the proxied server; the header contains a copy of the original Host header, and allows the proxied server to see what its public address is.
Many web application frameworks, including Rails as I write this, look for this header in order to behave correctly.
It would be wonderful if lighttpd's mod_proxy could also send this header.
[mod_proxy] set X-Forwarded-Host (fixes #418)
lighttpd appends the request "Host" to the non-standard header "X-Host"
when acting as a reverse proxy. This patch additionally appends "Host"
to the non-standard header "X-Forwarded-Host" to match the convention in
some other web servers
"mod_proxy should send the X-Forwarded-Host header to the proxied server"
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