CSRF Failed: Referer checking failed no Referer

postman模拟登录出了这个错误,其实看标题就知道大概是怎么回事,网上大概找了办法,也没说到位,所以干脆自己找源码了.

问题很明显就是出在 CSRF 上,理所当然去查看 CsrfViewMiddleware 中间件:

 1 class CsrfViewMiddleware(object):
 2 
 3     def _accept(self, request):
 4        
 5         request.csrf_processing_done = True
 6         return None
 7 
 8     def _reject(self, request, reason):
 9         logger.warning('Forbidden (%s): %s', reason, request.path,
10             extra={
11                 'status_code': 403,
12                 'request': request,
13             }
14         )
15         return _get_failure_view()(request, reason=reason)
16 
17     def process_view(self, request, callback, callback_args, callback_kwargs):
18 
19         if getattr(request, 'csrf_processing_done', False):
20             return None
21 
22         try:
23             csrf_token = _sanitize_token(
24                 request.COOKIES[settings.CSRF_COOKIE_NAME])
25             request.META['CSRF_COOKIE'] = csrf_token
26         except KeyError:
27             csrf_token = None
28            
29             request.META["CSRF_COOKIE"] = _get_new_csrf_key()
30         
31             return None
32 e that anything not defined as 'safe' by RFC2616 needs protection
33         if request.method not in ('GET', 'HEAD', 'OPTIONS', 'TRACE'):
34             if getattr(request, '_dont_enforce_csrf_checks', False):
35                 return self._accept(request)
36 
37             if request.is_secure():
38                 referer = force_text(
39                     request.META.get('HTTP_REFERER'),
40                     strings_only=True,
41                     errors='replace'
42                 )
43                 if referer is None:
44                     return self._reject(request, REASON_NO_REFERER)　　　　　　# 问题就出在这里　　
45 
46                 good_referer = 'https://%s/' % request.get_host()
47                 if not same_origin(referer, good_referer):
48                     reason = REASON_BAD_REFERER % (referer, good_referer)
49                     return self._reject(request, reason)
50 
51             if csrf_token is None:
52                 return self._reject(request, REASON_NO_CSRF_COOKIE)
53             request_csrf_token = ""
54             if request.method == "POST":
55                 try:
56                     request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')
57                 except IOError:
58                     pass
59 
60             if request_csrf_token == "":
61                 request_csrf_token = request.META.get('HTTP_X_CSRFTOKEN', '')
62 
63             if not constant_time_compare(request_csrf_token, csrf_token):
64                 return self._reject(request, REASON_BAD_TOKEN)
65 
66         return self._accept(request)

首先在文件里面搜索报错的信息字符串,找到这个:

REASON_NO_REFERER = "Referer checking failed - no Referer."

然后搜索 REASON_NO_REFERER 就会找到上面的那一段代码中出错的位置.(为什么写这些东西,因为我有个同学就是从来都不会找出错原因,方法有时候比结论更重要)

然后代码里面说的很清楚了, referer = request.META.get('HTTP_REFERER')

这就说明请求头里面没有 REFERER这个信息,都知道的,Django会把自定义的请求头大写并在前面添加 HTTP_ ,所以在postman的header里面添加这个 referer 字段就好了.

注意,referer的格式是 https://www.domain.com/. 后面有个点

然后就OK了

多说两句,看看人家django多贴心,如果是post请求的话,会尝试从两个地方获取csrftoken,请求体里面可以放,就算忘了放,还会从请求头里面拿(54行 - 64行)