Install Fsx script as a windows service

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// HttpEcho.fsx
open System.Net
open System

let echo prefix =
    let listener =  new HttpListener(IgnoreWriteExceptions = true)
    listener.Prefixes.Add prefix
    listener.Start()

    let rec listen() =
        async {
        let! context = listener.GetContextAsync() |> Async.AwaitTask

        async {
            let request = context.Request
            let response = context.Response

            try
                response.StatusCode <- 200
                response.ContentType <- request.ContentType

                if request.HasEntityBody then
                    do! request.InputStream.CopyToAsync(response.OutputStream) |> Async.AwaitTask
            with
            | ex ->
                response.StatusCode <- 500
                response.StatusDescription <- ex.Message

            context.Response.Close()
        } |> Async.Start

        return! listen() }
       
    listen() |> Async.Start

    listener


let cancel = new Threading.Tasks.TaskCompletionSource<unit>()
Console.CancelKeyPress |> Event.add (fun e -> cancel.SetResult(); e.Cancel <- true)

async
 { 
    let prefix = "http://*:80/"
    use _ = echo prefix
    printfn "Listening on %s" prefix
    do! Async.AwaitTask cancel.Task
    printfn "Stop"

} |> Async.RunSynchronously


 

namespace System

namespace System.Net

val echo : prefix:string -> HttpListener

Full name: Script.echo

val prefix : string

val listener : HttpListener

Multiple items
type HttpListener =
  new : unit -> HttpListener
  member Abort : unit -> unit
  member AuthenticationSchemeSelectorDelegate : AuthenticationSchemeSelector with get, set
  member AuthenticationSchemes : AuthenticationSchemes with get, set
  member BeginGetContext : callback:AsyncCallback * state:obj -> IAsyncResult
  member Close : unit -> unit
  member DefaultServiceNames : ServiceNameCollection
  member EndGetContext : asyncResult:IAsyncResult -> HttpListenerContext
  member ExtendedProtectionPolicy : ExtendedProtectionPolicy with get, set
  member ExtendedProtectionSelectorDelegate : ExtendedProtectionSelector with get, set
  ...
  nested type ExtendedProtectionSelector

Full name: System.Net.HttpListener

--------------------
HttpListener() : unit

property HttpListener.Prefixes: HttpListenerPrefixCollection

HttpListenerPrefixCollection.Add(uriPrefix: string) : unit

HttpListener.Start() : unit

val listen : (unit -> Async<'a>)

val async : AsyncBuilder

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.async

val context : obj

Multiple items
type Async
static member AsBeginEnd : computation:('Arg -> Async<'T>) -> ('Arg * AsyncCallback * obj -> IAsyncResult) * (IAsyncResult -> 'T) * (IAsyncResult -> unit)
static member AwaitEvent : event:IEvent<'Del,'T> * ?cancelAction:(unit -> unit) -> Async<'T> (requires delegate and 'Del :> Delegate)
static member AwaitIAsyncResult : iar:IAsyncResult * ?millisecondsTimeout:int -> Async<bool>
static member AwaitTask : task:Task<'T> -> Async<'T>
static member AwaitWaitHandle : waitHandle:WaitHandle * ?millisecondsTimeout:int -> Async<bool>
static member CancelDefaultToken : unit -> unit
static member Catch : computation:Async<'T> -> Async<Choice<'T,exn>>
static member FromBeginEnd : beginAction:(AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg:'Arg1 * beginAction:('Arg1 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * beginAction:('Arg1 * 'Arg2 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromBeginEnd : arg1:'Arg1 * arg2:'Arg2 * arg3:'Arg3 * beginAction:('Arg1 * 'Arg2 * 'Arg3 * AsyncCallback * obj -> IAsyncResult) * endAction:(IAsyncResult -> 'T) * ?cancelAction:(unit -> unit) -> Async<'T>
static member FromContinuations : callback:(('T -> unit) * (exn -> unit) * (OperationCanceledException -> unit) -> unit) -> Async<'T>
static member Ignore : computation:Async<'T> -> Async<unit>
static member OnCancel : interruption:(unit -> unit) -> Async<IDisposable>
static member Parallel : computations:seq<Async<'T>> -> Async<'T []>
static member RunSynchronously : computation:Async<'T> * ?timeout:int * ?cancellationToken:CancellationToken -> 'T
static member Sleep : millisecondsDueTime:int -> Async<unit>
static member Start : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions * ?cancellationToken:CancellationToken -> Task<'T>
static member StartChild : computation:Async<'T> * ?millisecondsTimeout:int -> Async<Async<'T>>
static member StartChildAsTask : computation:Async<'T> * ?taskCreationOptions:TaskCreationOptions -> Async<Task<'T>>
static member StartImmediate : computation:Async<unit> * ?cancellationToken:CancellationToken -> unit
static member StartWithContinuations : computation:Async<'T> * continuation:('T -> unit) * exceptionContinuation:(exn -> unit) * cancellationContinuation:(OperationCanceledException -> unit) * ?cancellationToken:CancellationToken -> unit
static member SwitchToContext : syncContext:SynchronizationContext -> Async<unit>
static member SwitchToNewThread : unit -> Async<unit>
static member SwitchToThreadPool : unit -> Async<unit>
static member TryCancelled : computation:Async<'T> * compensation:(OperationCanceledException -> unit) -> Async<'T>
static member CancellationToken : Async<CancellationToken>
static member DefaultCancellationToken : CancellationToken

Full name: Microsoft.FSharp.Control.Async

--------------------
type Async<'T>

Full name: Microsoft.FSharp.Control.Async<_>

static member Async.AwaitTask : task:Threading.Tasks.Task<'T> -> Async<'T>

val request : obj

val response : obj

val ex : exn

property Exception.Message: string

static member Async.Start : computation:Async<unit> * ?cancellationToken:Threading.CancellationToken -> unit

val cancel : Threading.Tasks.TaskCompletionSource<unit>

Full name: Script.cancel

namespace System.Threading

namespace System.Threading.Tasks

Multiple items
type TaskCompletionSource<'TResult> =
  new : unit -> TaskCompletionSource<'TResult> + 3 overloads
  member SetCanceled : unit -> unit
  member SetException : exception:Exception -> unit + 1 overload
  member SetResult : result:'TResult -> unit
  member Task : Task<'TResult>
  member TrySetCanceled : unit -> bool
  member TrySetException : exception:Exception -> bool + 1 overload
  member TrySetResult : result:'TResult -> bool

Full name: System.Threading.Tasks.TaskCompletionSource<_>

--------------------
Threading.Tasks.TaskCompletionSource() : unit
Threading.Tasks.TaskCompletionSource(creationOptions: Threading.Tasks.TaskCreationOptions) : unit
Threading.Tasks.TaskCompletionSource(state: obj) : unit
Threading.Tasks.TaskCompletionSource(state: obj, creationOptions: Threading.Tasks.TaskCreationOptions) : unit

type unit = Unit

Full name: Microsoft.FSharp.Core.unit

type Console =
  static member BackgroundColor : ConsoleColor with get, set
  static member Beep : unit -> unit + 1 overload
  static member BufferHeight : int with get, set
  static member BufferWidth : int with get, set
  static member CapsLock : bool
  static member Clear : unit -> unit
  static member CursorLeft : int with get, set
  static member CursorSize : int with get, set
  static member CursorTop : int with get, set
  static member CursorVisible : bool with get, set
  ...

Full name: System.Console

event Console.CancelKeyPress: IEvent<ConsoleCancelEventHandler,ConsoleCancelEventArgs>

Multiple items
module Event

from Microsoft.FSharp.Control

--------------------
type Event<'T> =
  new : unit -> Event<'T>
  member Trigger : arg:'T -> unit
  member Publish : IEvent<'T>

Full name: Microsoft.FSharp.Control.Event<_>

--------------------
type Event<'Delegate,'Args (requires delegate and 'Delegate :> Delegate)> =
  new : unit -> Event<'Delegate,'Args>
  member Trigger : sender:obj * args:'Args -> unit
  member Publish : IEvent<'Delegate,'Args>

Full name: Microsoft.FSharp.Control.Event<_,_>

--------------------
new : unit -> Event<'T>

--------------------
new : unit -> Event<'Delegate,'Args>

val add : callback:('T -> unit) -> sourceEvent:IEvent<'Del,'T> -> unit (requires delegate and 'Del :> Delegate)

Full name: Microsoft.FSharp.Control.Event.add

val e : ConsoleCancelEventArgs

Threading.Tasks.TaskCompletionSource.SetResult(result: unit) : unit

property ConsoleCancelEventArgs.Cancel: bool

val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn

property Threading.Tasks.TaskCompletionSource.Task: Threading.Tasks.Task<unit>

static member Async.RunSynchronously : computation:Async<'T> * ?timeout:int * ?cancellationToken:Threading.CancellationToken -> 'T