@Test(expected = IOException.class)
 public void testJavaNetTransport_notFound() throws IOException {
   Transport transport = new URLConnectionTransport();
   try (InputStream is =
       transport.open("https://storage.googleapis.com/adx-rtb-dictionaries/doesnt.exist")) {}
 }
 @Test
 public void testJavaNetTransport() throws IOException {
   Transport transport = new URLConnectionTransport();
   try (InputStream is =
       transport.open("https://storage.googleapis.com/adx-rtb-dictionaries/vendors.txt")) {}
 }