Django 提交表单遇到403：CSRF verification failed

UserWarning: A {% csrf_token %} was used in a template, but the context did not provide the value.  This is usually caused by not using RequestContext.
  "A {% csrf_token %} was used in a template, but the context "

• 根据提示，权限验证没有成功，需要3个地方需要注意

   {% csrf_token %}  

return render_to_response('user/login.html', kwargs,
        RequestContext(request))

 'django.middleware.csrf.CsrfViewMiddleware',

但是我已经设置了这三个地方，还是不停的403，根本没办法。最后更换了views.py里面的方法！成功了

return render(request,'user/login.html',kwargs)
# return render_to_response('user/login.html', kwargs, RequestContext(request))