OpenResty (aka. ngx_openresty) is a full-fledged web application server by
bundling the standard Nginx
core, lots of 3rd-party Nginx
modules, as well as most of their external dependencies.
By taking
advantage of various well-designed Nginx modules, OpenResty effectively turns
the nginx server into a powerful web app server, in which the web developers
can use the Lua programming language to script various existing nginx C modules
and Lua modules and construct extremely high-performance web applications that
are capable to handle 10K+ connections.
OpenResty aims to run your
server-side web app completely in the Nginx server, leveraging Nginx‘s event
model to do non-blocking I/O not only with the HTTP clients, but also with
remote backends like MySQL, PostgreSQL, Memcached, and Redis.
OpenResty
is not an Nginx fork. It is just a software bundle. Most of the patches
applied to the Nginx core in OpenResty have already been submitted to the
official Nginx team and most of the patches submitted have also been accepted.
We are trying hard not to fork Nginx and always to use the latest best
Nginx core from the official Nginx team.
来源：
原文：http://www.cnblogs.com/OnlyDreams/p/3773729.html