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:

class CsrfViewMiddleware(object):

    def _accept(self, request):
       
        request.csrf_processing_done = True
        return None

    def _reject(self, request, reason):
        logger.warning('Forbidden (%s): %s', reason, request.path,
            extra={
                'status_code': 403,
                'request': request,
            }
        )
        return _get_failure_view()(request, reason=reason)

    def process_view(self, request, callback, callback_args, callback_kwargs):

        if getattr(request, 'csrf_processing_done', False):
            return None

        try:
            csrf_token = _sanitize_token(
                request.COOKIES[settings.CSRF_COOKIE_NAME])
            request.META['CSRF_COOKIE'] = csrf_token
        except KeyError:
            csrf_token = None
           
            request.META["CSRF_COOKIE"] = _get_new_csrf_key()
        
            return None
e that anything not defined as 'safe' by RFC2616 needs protection
        if request.method not in ('GET', 'HEAD', 'OPTIONS', 'TRACE'):
            if getattr(request, '_dont_enforce_csrf_checks', False):
                return self._accept(request)

            if request.is_secure():
                referer = force_text(
                    request.META.get('HTTP_REFERER'),
                    strings_only=True,
                    errors='replace'
                )
                if referer is None:
                    return self._reject(request, REASON_NO_REFERER)　　　　　　# 问题就出在这里　　

                good_referer = 'https://%s/' % request.get_host()
                if not same_origin(referer, good_referer):
                    reason = REASON_BAD_REFERER % (referer, good_referer)
                    return self._reject(request, reason)

            if csrf_token is None:
                return self._reject(request, REASON_NO_CSRF_COOKIE)
            request_csrf_token = ""
            if request.method == "POST":
                try:
                    request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')
                except IOError:
                    pass

            if request_csrf_token == "":
                request_csrf_token = request.META.get('HTTP_X_CSRFTOKEN', '')

            if not constant_time_compare(request_csrf_token, csrf_token):
                return self._reject(request, REASON_BAD_TOKEN)

        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)