WSGI (PEP3333) It is just an interface specification by which server and application communicate.

Not a server, a python module, a framework, an API or any kind of software.

WSGI參考

http://wsgi.tutorial.codepoint.net/

http://blog.ez2learn.com/2010/01/27/introduction-to-wsgi/

http://python.jobbole.com/87329/