anchor.diff:    TestServerMain testServerMain = new TestServerMain();
     testServerMain.setServerStartedHandler((int port) {
       var request = SyncHttpClient
  -        .getUrl(new Uri.http("127.0.0.1:$port", "/thisisnotfound"));
  +        .getUrl(new Uri.http("localhost:$port", "/thisisnotfound"));
       var response = request.close();
       expect(HttpStatus.NOT_FOUND, equals(response.statusCode));
       expect("Page not found", equals(response.body));
  
positive.code:   TestServerMain testServerMain = new TestServerMain();
    testServerMain.setServerStartedHandler((int port) {
      var request =
          SyncHttpClient.getUrl(new Uri.http("127.0.0.1:$port", "/0123456789"));
      var response = request.close();
      expect(HttpStatus.OK, equals(response.statusCode));
      expect(11, equals(response.contentLength));
  
negative.code:   TestServerMain testServerMain = new TestServerMain();
    testServerMain.setServerStartedHandler((int port) {
      var request =
          SyncHttpClient.getUrl(new Uri.http("localhost:$port", "/huge"));
      var response = request.close();
      String expected =
          new List<int>.generate((1 << 20), (i) => (i + 1) % 256).toString();
  