def test_applicationProvidedServerAndDate(self):
        """
        If either I{Server} or I{Date} is included in the headers passed to the
        I{start_response} callable, they are disregarded.
        """
        return self._headersTest(
            [('server', 'foo'), ('Server', 'foo'),
             ('date', 'bar'), ('dATE', 'bar')],
            [])

        If either I{Server} or I{Date} is included in the headers passed to the
        I{start_response} callable, they are disregarded.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_wsgi.py