This is the input to create a Platform.worker

A set of required ports

- `writeResponse` is your function created with your port `onHttpResponse`


    port onHttpResponse : Json.Encode.Value -> Cmd msg


    writeResponse =
        Webapp.Server.writeResponse onHttpResponse






- `onHttpRequest` is a port defined in your `Server.elm`


    port onHttpRequest : (Json.Encode.Value -> msg) -> Sub msg

A set of required protocols.

• headerDecoder decoded value will be made available to updateFromRoute and updateFromClient
• clientMsgDecoder decodes the request body IF request was sent from Client sendToServer
  • updateFromClient is called if clientMsgDecoder succeeds
  • serverMsgEncoder encodes the response body for a successful clientMsgDecoder
  • errorEncoder encodes the response body for a failed clientMsgDecoder
• routeDecoder decodes a Url.Url; if successful, updateFromRoute will be called
  • updateFromRoute is called as long as headerDecoder succeeds
  • otherwise Webapp.Server will respond with error 500

Exported type to enable apps to write their type signature of main, e.g.

main : Webapp.Server.Program Flags ServerState RequestContext Msg Error MsgFromServer
main =
    Webapp.Server.worker { ... }

Returns a Webapp.Server program, capable of communicating with Webapp.Client program

Use this to wire up your port in your own Server.elm

port onHttpResponse : Json.Encode.Value -> Cmd msg


writeResponse =
    Webapp.Server.writeResponse onHttpResponse

Use this to wire up your port in your own Server.elm via websocket

port writeWs : Json.Encode.Value -> Cmd msg


writeWebsocketMessage =
    Webapp.Server.writeWebsocketMessage writeWs