def METHOD_NAME(self, app):
    cl = blueprint.MAX_FILE_SIZE + 1
    self.mock_out_urls(
        self.url,
        headers={'Content-Length': six.text_type(cl)},
        body='c' * cl)
    proxied_url = proxy.get_proxified_resource_url(self.data_dict)
    result = app.get(proxied_url)
    assert result.status_code == 409
    assert six.b('too large') in result.data