| safeLink | Servant.Links, Servant.API |
| safeLink' | Servant.Links |
| SBool | Servant.API |
| sbool | Servant.API |
| SBoolI | Servant.API |
| Secure | Servant.API.IsSecure, Servant.API |
| SFalse | Servant.API |
| SingleParam | Servant.Links |
| Skip | Servant.Types.SourceT |
| source | Servant.Types.SourceT |
| SourceIO | Servant.API.Stream, Servant.API |
| SourceT | |
| 1 (Type/Class) | Servant.Types.SourceT |
| 2 (Data Constructor) | Servant.Types.SourceT |
| SourceToSourceIO | Servant.API.Stream |
| sourceToSourceIO | Servant.API.Stream |
| Statuses | Servant.API.UVerb, Servant.API, Servant.API |
| statuses | Servant.API.UVerb |
| StatusOf | Servant.API.UVerb, Servant.API, Servant.API |
| statusOf | Servant.API.UVerb, Servant.API |
| statusVal | Servant.API.Status |
| StdMethod | Servant.API.Verbs, Servant.API |
| StepT | Servant.Types.SourceT |
| Stop | Servant.Types.SourceT |
| Stream | Servant.API.Stream, Servant.API |
| StreamBody | Servant.API.Stream, Servant.API |
| StreamBody' | Servant.API.Stream, Servant.API |
| StreamGet | Servant.API.Stream, Servant.API |
| StreamingEndpoint | Servant.Test.ComprehensiveAPI |
| StreamPost | Servant.API.Stream, Servant.API |
| Strict | Servant.API.Modifiers, Servant.API |
| STrue | Servant.API |
| Summary | Servant.API.Description, Servant.API |