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Asked: 2026-05-16T23:26:06+00:00

Is there a web server library for F#, similar to SimpleHTTPServer in Python? Installing

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Is there a web server library for F#, similar to SimpleHTTPServer in Python?

Installing a full server like IIS is overkill for what I want, which is a simple application that can be queried using a web browser, effectively using HTTP as a monitoring method. Ideally, a request to the address /engines/id/state would map to a function get_state(engine_id) which I provide.

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  1. Editorial Team

    A self-hosted WCF service is not a bad start; here’s a tiny one for starters:

    open System
open System.IO 
// add reference to these two guys, need .NET full (not client profile)
open System.ServiceModel
open System.ServiceModel.Web

[<ServiceContract>]
type MyContract() =
    [<OperationContract>]
    [<WebGet(UriTemplate="{s}/{t}")>]
    member this.Get(s:string, t:string) : Stream =
        let html = sprintf @"
<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">
<html><head></head><body>Called with '%s' and '%s'</body></html>" s t
        upcast new MemoryStream(System.Text.Encoding.UTF8.GetBytes(html))

let Main() =
    let address = "http://localhost:64385/"
    let host = new WebServiceHost(typeof<MyContract>, new Uri(address))
    host.AddServiceEndpoint(typeof<MyContract>, new WebHttpBinding(), "") 
        |> ignore
    host.Open()
    printfn "Server running at %s" address
    printfn "Press a key to close server"
    System.Console.ReadKey() |> ignore
    host.Close()

Main()
// now go hit 
// http://localhost:64385/foo/42
// in your browser
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