null) {
            assert_equals(actual, "");
          } else if (expectedType instanceof RegExp) {
            assert_regexp_match(actual, expectedType);
          } else {
            assert_equals(actual, "Content-Type: " + expectedType + "\n");
          }
        }, title)
      }
      request(
        function _String() { return ""; },
        {"Content-Type": ""},
        "",
        'setRequestHeader("") sends a blank string'
      )
      request(
        function _String() { return ""; },
     