Question

我在django中间件中使用了process_request和process_response函数，以便在命中视图集之前记录请求。但是，我得到内部服务器错误。我不明白我的代码有什么问题。

class MyMiddleware(): 
    def process_request( self, request ): 
        print "xxxxx"
        return Response( status=status.HTTP_200_OK ) 
    def process_response( self, request, response ): 
        print "xxxxx" 
        return Response( status=status.HTTP_200_OK )

我错过了什么？错误是

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 86, in run
    self.finish_response()
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 127, in finish_response
    for data in self.result:
  File "/usr/local/lib/python2.7/dist-packages/django/template/response.py", line 118, in __iter__
    raise ContentNotRenderedError('The response content must be '
ContentNotRenderedError: The response content must be rendered before it can be iterated over.

----------------------------------------

Traceback (most recent call last):
  File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/local/lib/python2.7/dist-packages/django/core/servers/basehttp.py", line 126, in __init__
    super(WSGIRequestHandler, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/SocketServer.py", line 649, in __init__
    self.handle()
  File "/usr/lib/python2.7/wsgiref/simple_server.py", line 124, in handle
    handler.run(self.server.get_app())
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 92, in run
    self.close()
  File "/usr/lib/python2.7/wsgiref/simple_server.py", line 33, in close
    self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'
----------------------------------------

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 86, in run
    self.finish_response()
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 127, in finish_response
    for data in self.result:
  File "/usr/local/lib/python2.7/dist-packages/django/template/response.py", line 118, in __iter__
    raise ContentNotRenderedError('The response content must be '
ContentNotRenderedError: The response content must be rendered before it can be iterated over.

----------------------------------------

Traceback (most recent call last):
  File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/local/lib/python2.7/dist-packages/django/core/servers/basehttp.py", line 126, in __init__
    super(WSGIRequestHandler, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/SocketServer.py", line 649, in __init__
    self.handle()
  File "/usr/lib/python2.7/wsgiref/simple_server.py", line 124, in handle
    handler.run(self.server.get_app())
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 92, in run
    self.close()
  File "/usr/lib/python2.7/wsgiref/simple_server.py", line 33, in close
    self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'
----------------------------------------

Answer 1

问题在于中间件方法中的return Response()。

如果您在process_request方法中返回响应，则Django将不会调用该视图。你可能不想在这里退货。

您应该从process_response方法返回回复。您可能希望在此处返回视图（response）中的原始响应。如果您返回不同的响应（例如Response(...)），则Django会将此返回给用户而不是视图中的响应。

class MyMiddleware(): 
    def process_request(self, request): 
        print "xxxxx"

    def process_response(self, request, response): 
        print "xxxxx"
        return response

有关从每个中间件方法返回的内容的更多信息，请参阅Django文档。

Answer 2

我解决了这个问题。这是因为process_response返回的响应对象没有实际响应。我把它修改为跟随并且有效。

class MyMiddleware(): 
    def process_request( self, request ): 
        print "xxxxx"
        return None
    def process_response( self, request, response ): 
        print "xxxxx" 
        return response

使用django中间件时ContentNotRenderedError

2 个答案: