从请求到响应 django 都做了哪些处理

正文

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django 的中间件至少含有以下四个方法中的一个：process_request, process_response, process_view, process_exception。这些方法会被 WSGI handler 收集并按照顺序调用。

process_request

我们可以先来看看 django.contrib.auth.middleware.AuthenticationMiddleware:

def get_user(request):
    if not hasattr(request, '_cached_user'):
        request._cached_user = auth.get_user(request)
    return request._cached_user

class AuthenticationMiddleware(MiddlewareMixin):
    def process_request(self, request):
        assert hasattr(request, 'session'), (
              "The Django authentication middleware requires session middleware "
              "to be installed. Edit your MIDDLEWARE%s setting to insert "
              "'django.contrib.sessions.middleware.SessionMiddleware' before "
              "'django.contrib.auth.middleware.AuthenticationMiddleware'."

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