I've been unable to solve a problem while requesting an access_token on Spotify API with Meteor HTTP. Indeed, when I make a POST call to the Spotify https://accounts.spotify.com/api/token. I get the following response :

{statusCode:400,content:{error:unsupported_grant_type,error_description:grant_type must be client_credentials, authorization_code or refresh_token}

I think this may have something to do with the Content-Type header and the encoding of the BODY parameter but I haven't been able to solve this issue. I tried to use both data and params and none of these worked.

Here is my code :

HTTP.post(https://accounts.spotify.com/api/token, {

      data: {

        grant_type : authorization_code,

        code : authCode,

        redirect_uri : Router.routes['redirect_spotify'].url()

      },

      headers: {

        'Authorization' : Basic  + CryptoJS.enc.Base64.stringify(CryptoJS.enc.Utf8.parse(xxxx:yyyyy)),

        'Content-Type':'application/x-www-form-urlencoded'

      }

    }, function(error, result) {

      console.log(POST made with data : %j, result);

      if (error){

        Registrations.remove({userId : this.userId });

        return;

      }

      Registrations.update({

        userId : this.userId },

      {$set : {

        state: Done,

        accessToken: result.access_token,

        //TODO expires

        refreshToken: result.refresh_token

        }},

      { upsert : true}

    );

    });

Thank you all in advance :) Love Meteor