https://www.haproxy.com/blog/accelerate-your-apis-by-using-the-haproxy-cache/
https://www.haproxy.com/blog/introduction-to-haproxy-acls/
https://www.haproxy.com/blog/introduction-to-haproxy-logging/
https://www.haproxy.com/blog/haproxy-log-customization/