With Go 1.20 the "Rewrite" hook for ReverseProxy was introduced to
supersede of the "Director" hook (see:
a55793835f)
The Rewrite hooks allows for better separation between the incoming and
outgoing request. In particular it makes it pretty easy to set the
correct X-Forwarded-* Headers on the outgoing request.
The need for using "Rewrite" came up when trying to embed
authelia. It uses the X-Forwarded-Host and X-Forwared-Proto headers to
e.g. compute the correct return values for the various endpoints in
.well-known/openid-configuration.
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