Add support for custom reverse proxy endpoints

[ezhevita]

Resolves the problem with setup when reverse proxy is located on other IP than localhost (e.g. running ASF in docker and nginx on the host machine) by providing user a way to configure reverse proxies (so ASF would trust X-Forwarded headers).

[JustArchi]

Also I'm wondering if we shouldn't use KnownNetworks instead - it makes far more sense to allow e.g. whole LAN network rather than single IPs, and you should be able to put single IP into known network as well, since it's just /32.

[JustArchi]

LGTM, giving it a bit more time for evaluation before merging.

[JustArchi]

In the meantime please check if it behaves as you expect it to, thanks 🏆

[ezhevita]

Works as expected in my setup 👍

[JustArchi]

@vital7 can you show example configuration for kestrel that you've used for testing this? I want to add it to the doc, and ensure that I didn't screw up the syntax, thanks.

[ezhevita]

Sure:

{
  "Kestrel": {
    "Endpoints": {
      "Endpoint1": {
        "Url": "http://*:1242/"
      }
    },
    "PathBase": "/main/",
    "KnownNetworks": ["192.168.1.80/32"]
  }
}

[JustArchi]

Thanks for contribution as usual 🏆