Function to get the contents of a URL asynchronously

FSharpHttpAsync.fs

open System.Net

let getHttpContents (url:string) = async {
  let req = WebRequest.Create(url)
  let! response = req.AsyncGetResponse()
  use stream = response.GetResponseStream()
  use streamreader = new System.IO.StreamReader(stream)
  let contents = streamreader.ReadToEnd()
  return contents
} 

printfn "%s" ( (getHttpContents "http://www.google.com") |> Async.RunSynchronously )