Getting Facebook Auth Token Using FSharp - facebook

Question

I am trying to get the OAuth token from facebook using the following code:
let applicationId = "12345"
let applicationSecret = "12345"
let tokenBuilder = new StringBuilder()
tokenBuilder.Append("https://graph.facebook.com/v2.3/oauth/access_token?")
tokenBuilder.Append("client_id=")
tokenBuilder.Append(applicationId)
tokenBuilder.Append("&redirect_uri=")
tokenBuilder.Append("https://www.facebook.com/connect/login_success.html")
tokenBuilder.Append("&client_secret=")
tokenBuilder.Append(applicationSecret)
let tokenUri = tokenBuilder.ToString()
let tokenClient = new WebClient()
let tokenResponse = tokenClient.UploadString(tokenUri,String.Empty)
When I run it, I get this:
System.Net.WebException: The remote server returned an error: (400)
Bad Request.
Can anyone tell me what I am doing wrong? There are a bunch of configurations that I can make for the application that I guessed like this:

Answer 1

Not exactly the answer to your question, but this is how you can get the OAuth2 bearer token using FacebookClient from Facebook SDK:
// nuget Facebook package
open Facebook
type Credentials() = // There are better ways around to make a POCO, anyways...
member __.client_id with get() = "...your facebook app id here"
member __.client_secret with get() = "...your facebook app secret here"
member __.grant_type with get() = "client_credentials"
let fb = FacebookClient()
let token = fb.Get("oauth/access_token", Credentials())
getting back into token something like:
seq [[access_token, 239907752864330+s3c5obp-fO7DoVX4pPiN69OdAS4]]