[feat]: additional headers

[jkuri]

1. Request

Each proxy should send additional headers with initial request so the server behind proxy knows information about the client.
Check https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers the Proxy section;

• X-Forwarded-For
  Identifies the originating IP addresses of a client connecting to a web server through an HTTP proxy or a load balancer.
• X-Forwarded-Host
  Identifies the original host requested that a client used to connect to your proxy or load balancer.
• X-Forwarded-Proto
  identifies the protocol (HTTP or HTTPS) that a client used to connect to your proxy or load balancer.

2. Response

Add our own header in response so if someone checks it knows it was proxied by our reverse proxy,
just like everyone else do.

header name is server, add server: bproxy [VERSION], example for nginx: