Support non-root prefixed reverse proxy environments #45
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We'd like to use caddy-security in an reverse-proxy environment where caddy is routed from a fixed-prefix i.e.
myapp.mydomain.com/app1/oauth2/github -> ( reverse proxy ) -> app1backend.mydomain.com/oauth2/github
We encountered issues where the
redirect_urlwas being set to app1backend.mydomain.com which was corrected by settingX-Forwarded-Host. This still left the issue where theapp1prefix was being dropped in theredirect_url.A number of standard reverse proxies use the
X-Forwarded-Prefixto forward any prefix mapping onto backend applications.This PR looks the add
X-Forwarded-Prefixsupport to allow caddy-security to work in prefixed reverse proxies environments.