common.py 文件源码

def process_response(self, request, response):
        """
        Calculate the ETag, if needed.

        When the status code of the response is 404, it may redirect to a path
        with an appended slash if should_redirect_with_slash() returns True.
        """
        # If the given URL is "Not Found", then check if we should redirect to
        # a path with a slash appended.
        if response.status_code == 404:
            if self.should_redirect_with_slash(request):
                return self.response_redirect_class(self.get_full_path_with_slash(request))

        if settings.USE_ETAGS:
            if not response.has_header('ETag'):
                set_response_etag(response)

            if response.has_header('ETag'):
                return get_conditional_response(
                    request,
                    etag=unquote_etag(response['ETag']),
                    response=response,
                )

        return response