Web开发

python wsgi教程1——介绍

WSGI(Web Server Gateway Interface)并不是一个服务器，而是一个协议。最开始是用Python写的，现在很多语言都有了对应的实现。详细内容可以看这里： http://www.python.org/dev/peps/pep-3333/

WSGI应用程序接口是一个可调用的对象。它必须接收两个固定的参数：一个包含了类似CGI变量的字典；一个可调用的函数用于返回HTTP状态代码和数据头。

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# This is our application object. It could have any name,
# except when using mod_wsgi where it must be "application"
def application( # It accepts two arguments:
      # environ points to a dictionary containing CGI like environment variables
      # which is filled by the server for each received request from the client
      environ,
      # start_response is a callback function supplied by the server
      # which will be used to send the HTTP status and headers to the server
      start_response):

   # build the response body possibly using the environ dictionary
   response_body = 'The request method was %s' % environ['REQUEST_METHOD']

   # HTTP response code and message
   status = '200 OK'

   # These are HTTP headers expected by the client.
   # They must be wrapped as a list of tupled pairs:
   # [(Header name, Header value)].
   response_headers = [('Content-Type', 'text/plain'),
                       ('Content-Length', str(len(response_body)))]

   # Send them to the server using the supplied function
   start_response(status, response_headers)

   # Return the response body.
   # Notice it is wrapped in a list although it could be any iterable.
   return [response_body]

以上是一个应用程序的基本框架。由于没有服务器，因此这段代码目前还不能运行。