The data representation of the URL’s relativeString.
- iOS 9.0+
- macOS 10.11+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 7.0+
If the URL was initialized with
init?(data, the data representation returned are the same bytes as those used at initialization; otherwise, the data representation returned are the bytes of the
relative encoded with UTF8 string encoding.