meteor - "415 Error" when querying Spotify for tokens

Question

I've been trying to recreate the spotify oauth connection in MeteorJS. I've gotten as far as requesting the access and refresh tokens, but I keep getting a 415 error now. Here is the relevant code:

 var results = HTTP.post(
                'https://accounts.spotify.com/api/token',
                {
                    data: {
                        code: code,
                        redirect_uri: redirectURI,
                        grant_type: 'authorization_code',
                        client_id: clientID,
                        client_secret: clientSecret
                    },
                    headers: {
                        'Content-Type':'application/json'
                    }
                }
            );

I can't seem to find any other good documentation of the problem and the code in this demo:

https://github.com/spotify/web-api-auth-examples/tree/master/authorization_code

works perfectly.

Answer 1

I had a similar problem (but in Java). The analogous solution was

                    headers: {
                        'Content-Type':'application/x-www-form-urlencoded'
                    }