Django中的wsgi:application

• 基本：
  • 　　uwsgi,uWSGI,WSGI三者关系

• • 　　详情请见：https://www.cnblogs.com/wspblog/p/8575101.html
　Django中wsgi application 调用最终返回的是response,在上一篇中，我们在handler.run()函数---setup_environ()函数中，将request原始信息复制到wsgi.input中

• 在回调函数的slef.request_class(env)会进一步封装成我们熟悉的request对象　　

  class WSGIHandler(base.BaseHandler):
      request_class = WSGIRequest
  
      def __init__(self, *args, **kwargs):
          super().__init__(*args, **kwargs)
          self.load_middleware()
  
      def __call__(self, environ, start_response):
  
          set_script_prefix(get_script_name(environ))
          signals.request_started.send(sender=self.__class__, environ=environ)
          request = self.request_class(environ)
          response = self.get_response(request)
          response._handler_class = self.__class__
          status = '%d %s' % (response.status_code, response.reason_phrase)
          response_headers = [
              *response.items(),
              *(('Set-Cookie', c.output(header='')) for c in response.cookies.values()),
          ]
          start_response(status, response_headers)
          if getattr(response, 'file_to_stream', None) is not None and environ.get('wsgi.file_wrapper'):
  
              response.file_to_stream.close = response.close
              response = environ['wsgi.file_wrapper'](response.file_to_stream, response.block_size)
  
          return respons