Introduction

Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.

Tornado can be roughly divided into four major components:

• A web framework (including RequestHandler which is subclassed to create web applications, and various supporting classes).
• Client- and server-side implementions of HTTP (HTTPServer and AsyncHTTPClient).
• An asynchronous networking library (IOLoop and IOStream), which serve as the building blocks for the HTTP components and can also be used to implement other protocols.
• A coroutine library (tornado.gen) which allows asynchronous code to be written in a more straightforward way than chaining callbacks.

The Tornado web framework and HTTP server together offer a full-stack alternative to WSGI. While it is possible to use the Tornado web framework in a WSGI container (WSGIAdapter), or use the Tornado HTTP server as a container for other WSGI frameworks (WSGIContainer), each of these combinations has limitations and to take full advantage of Tornado you will need to use the Tornado’s web framework and HTTP server together.

昨天查了下 了解到

• wsgi是专门python的一套协议，是学习cgi的基本逻辑应该;wsgi是uwsgi比较易用的实现；
• php-fpm是php的cgi套件；
• 本质上我自己理解wsgi只是协议规范，并不限制同步还是异步的；只是目前为止的实现都是同步的；这也导致tornado并不能完全兼容wsgi的一套。