Inside NGINX infographic: https://www.nginx.com/blog/inside-nginx-how-we-designed-for-performance-scale/
Socket Sharding in NGINX Release 1.9.1: https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/
LDAP Authentication with auth_request: https://www.nginx.com/blog/nginx-plus-authenticate-users/
Thread pools: https://www.nginx.com/blog/thread-pools-boost-performance-9x/