def test_postData(self):
        """
        Try to post content in the request, and check that the proxy client
        forward the body of the request.
        """
        return self._testDataForward(
            200, b"OK", [(b"Foo", [b"bar"])], b"Some data\r\n", b"POST", b"Some content")

        Try to post content in the request, and check that the proxy client
        forward the body of the request.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_proxy.py