# haproxyconf-2022

## Request lifecycle

1. HAProxy frontend external
2. HAProxy backend varnish
3. Varnish
4. HAProxy frontend internal
5. HAProxy backend internal
6. Web-server

## PROXY protocol

## Additional features

* reject request at TCP-level for maximum efficiency
* reject request at HTTP-level for maximum customizability
* per-site maintenance mode (with IP-whitelist bypass)
* customizable DEBUG level in HTTP headers
* per-site custom error response
* Let's Encrypt challenge pass-through