Index - U
| Unauthorized | Servant.Server.Internal.BasicAuth, Servant.Server.Internal, Servant.Server, Servant |
| UndecodableHeader | Servant |
| Union | Servant |
| Unique | Servant |
| unTagged | Servant.Server, Servant |
| URI | |
| 1 (Type/Class) | Servant |
| 2 (Data Constructor) | Servant |
| uriAuthority | Servant |
| uriFragment | Servant |
| uriPath | Servant |
| uriQuery | Servant |
| uriScheme | Servant |
| UVerb | Servant |