| RangeNotSatisfiable | Web.Minion.Response.Status |
| RawHeaderValue | |
| 1 (Type/Class) | Web.Minion.Response.Header |
| 2 (Data Constructor) | Web.Minion.Response.Header |
| redirect | Web.Minion.Error |
| ReqBody | |
| 1 (Type/Class) | Web.Minion.Request.Body, Web.Minion |
| 2 (Data Constructor) | Web.Minion.Request.Body, Web.Minion |
| reqBody | Web.Minion.Request.Body, Web.Minion |
| reqFormUrlEncoded | Web.Minion.Request.Body.FormUrlEncoded, Web.Minion |
| reqJson | Web.Minion.Request.Body.Json, Web.Minion.Json, Web.Minion |
| reqPlainText | Web.Minion.Request.Body.PlainText, Web.Minion |
| Request | |
| 1 (Data Constructor) | Web.Minion.Introspect |
| 2 (Data Constructor) | Web.Minion.Router.Internal, Web.Minion.Router |
| requestedRangeNotSatisfiable | Web.Minion.Error |
| requestEntityTooLarge | Web.Minion.Error |
| RequestHeaderFieldsTooLarge | Web.Minion.Response.Status |
| RequestTimeout | Web.Minion.Response.Status |
| requestURITooLong | Web.Minion.Error |
| RequestValue | Web.Minion.Request |
| Required | Web.Minion.Args.Internal, Web.Minion.Args, Web.Minion |
| ResetContent | Web.Minion.Response.Status |
| RespBody | |
| 1 (Type/Class) | Web.Minion.Response.Body, Web.Minion |
| 2 (Data Constructor) | Web.Minion.Response.Body, Web.Minion |
| Response | Web.Minion.Introspect |
| Reverse | Web.Minion.Args.Internal |
| Reverse' | Web.Minion.Args.Internal |
| reverse' | Web.Minion.Args.Internal |
| reverseHList | Web.Minion.Args.Internal |
| revHListToList | Web.Minion.Args.Internal |
| RevToList | Web.Minion.Args.Internal |
| RHList | Web.Minion.Args.Internal, Web.Minion.Args, Web.Minion |
| RHListToHList | Web.Minion.Args.Internal |
| RHNil | Web.Minion.Args.Internal, Web.Minion.Args, Web.Minion |
| route | Web.Minion.Router.Internal |
| routeHandle | Web.Minion.Router.Internal |
| Router | Web.Minion.Router.Internal, Web.Minion.Router, Web.Minion |
| Router' | Web.Minion.Router.Internal, Web.Minion.Router, Web.Minion |
| RoutingState | |
| 1 (Type/Class) | Web.Minion.Router.Internal |
| 2 (Data Constructor) | Web.Minion.Router.Internal |
| RunDelayed | Web.Minion.Args.Internal |
| runDelayed | Web.Minion.Args.Internal |
| runHidden | Web.Minion.Args.Internal |