如何在Django中request.method == None

Question

I am trying to figure out this issue related to Django from https://github.com/miki725/Django-jQuery-File-Uploader-Integration-demo/issues/1

Under what conditions can request.method == None in Django?

Answer 1

TL;DR: request.method is never None in real use, but for your particular case, you're looking at the wrong thing.

Generic HttpRequest

django/http/__init__.py :

class HttpRequest(object):
    ...
    def __init__(self):
        ...
        self.method = None
        ...

When a plain HttpRequest is instantiated, its method is None . But then, WSGIRequest and ModPythonRequest don't call HttpRequest.__init__ ever.

Requests through mod_wsgi

django/core/handlers/wsgi.py :

class WSGIRequest(http.HttpRequest):
    ...
    def __init__(self, environ):
        ...
        self.method = environ['REQUEST_METHOD'].upper()
        ...

The summary of this is that for mod_wsgi, request.method will never be None . If in some warped way you managed to get environ['REQUEST_METHOD'] not being defined or being None , the request would fail.

Requests through mod_python

django/core/handlers/modpython.py :

class ModPythonRequest(http.HttpRequest):
    ...
    def _get_method(self):
        return self.META['REQUEST_METHOD'].upper()
    ...
    method = property(_get_method)

Same remarks as with WSGIRequest apply. Can't ever be None .

Test client

django.test.client.RequestFactory.request instantiates a WSGIRequest and is called every time with REQUEST_METHOD defined in the environ as an uppercase string, as it should be.

---

Summary:

assert request.method is not None

You're looking for the error in the wrong place. In this case, request.method == 'POST' . It's failing when request.META.get('CONTENT_TYPE', '') is None . The reason for this is that the Content-Type header isn't being sent by the client in the request (don't ask me why, I'm not familiar with that stuff).

Answer 2

I was able to get this to happen via AJAX, specifically calling jQuery's $.ajax function (see http://api.jquery.com/jQuery.ajax/ ) with "POST" type but no data:

    $.ajax({
      type: "POST",
      url: "/something",
    });