Suave is a simple web development F# library providing a lightweight web server and a set of combinators to manipulate route flow and task composition.

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Serving static files, HTTP Compression and MIME types

A typical static file serving Suave application would look somewhat like this, placed in files.fsx and serving from ./public relative to your script file.

#!/usr/bin/env fsharpi
#r "./packages/Suave/lib/net40/Suave.dll"
open System.IO
open Suave
open Suave.Filters
open Suave.Operators
let app : WebPart =
  choose [
    GET >=> path "/" >=> Files.file "index.html"
    GET >=> Files.browseHome
    RequestErrors.NOT_FOUND "Page not found." 
let config =
  { defaultConfig with homeFolder = Some (Path.GetFullPath "./public") }

startWebServer config app

The main file combinators are file, browseHome and variations of these. To learn about all of them check out the Files module documentation

file will take the relative or absolute path for the file we want to serve to the client. It will set MIME-type headers based on the file extension.

browseHome will match existing files in the homeFolder based on the Url property and will serve them via the file combinator; homeFolder is a configuration parameter and can be set in the configuration record.

startWebServer { defaultConfig with homeFolder = Some @"C:\MyFiles" } app

Suave supports gzip and deflate http compression encodings. Http compression is configured via the MIME types map in the server configuration record.

By default Suave does not serve files with extensions not registered in the mime types map.

The default mime types map defaultMimeTypesMap looks like this.

let defaultMimeTypesMap = function
  | ".css" -> createMimeType "text/css" true
  | ".gif" -> createMimeType "image/gif" false
  | ".png" -> createMimeType "image/png" false
  | ".htm"
  | ".html" -> createMimeType "text/html" true
  | ".jpe"
  | ".jpeg"
  | ".jpg" -> createMimeType "image/jpeg" false
  | ".js"  -> createMimeType "application/x-javascript" true
  // ... some stuff left out
  | _      -> None

You can register additional MIME extensions by creating a new mime map in the following fashion.

// Adds a new mime type to the default map
let mimeTypes =
    @@ (function | ".avi" -> createMimeType "video/avi" false | _ -> None)

let webConfig = { defaultConfig with mimeTypesMap = mimeTypes }