nginx: A Practical Guide to High Performance (2015 September - Preview Edition)

Preview edition of unpublished:
"nginx: A Practical Guide to High Performance"

What is nginx:
Nginx (pronounced "engine x") is a web server with a strong focus on high concurrency, performance and low memory usage. It can also act as a reverse proxy server for HTTP, HTTPS, SMTP, POP3, and IMAP protocols, as well as a load balancer and an HTTP cache. (Src: Wikipedia)