Function request_scheme 

pub fn request_scheme(request: &Request, peer: &str, tls: bool) -> &'static str

client_ip with the trust list and mode given (no config read). The scheme the client used: https on a TLS connection; behind a trusted proxy that terminates TLS (trusted_proxies, unless client_ip = "peer"), what it says in X-Forwarded-Proto (its first value) or else Forwarded: proto=; http otherwise. For URLs rws hands back to the client (an agent card, an OAuth redirect URI) and the Secure cookie flag: behind a TLS-terminating load balancer the connection itself is plain HTTP.