| GenericURLContext | This abstract class is a generic URL context that accepts as the name argument either a string URL or a Name whose first component is a URL. |
| GenericURLDirContext | This abstract class is a generic URL DirContext that accepts as the name argument either a string URL or a Name whose first component is a URL. |
| Uri | A Uri object represents an absolute Uniform Resource Identifier (URI) as defined by RFC 2396 and updated by RFC 2373 and RFC 2732. |
| UrlUtil | Utilities for dealing with URLs. |