Discord API tells me: "401: Unauthorized" when i make a GET with Google-Scripts: "UrlFetchApp.fetch()" - google-apps-script

Question

I'm setting up a api connection. I want to get informations from discord api for my app.
So I implemented OAuth2 without any problems, I have my access token. Then I tried query some endpoints (/users/#me, /users/#me/guilds,...) but every time I get the same error.
I'm sending my authorization token in headers but it's still returning error 401.
I call the script with the generated url:
https://discordapp.com/api/oauth2/authorize?client_id=XYZ&redirect_uri=https%3A%2F%2Fscript.google.com%2Fmacros%2Fs%2FAKfycbyyt9-FiVv0zXOr8p8pMfojwEs2AXvBftVN1xdWeU3UQ1xgURD%2Fexec&response_type=code&scope=identify
Here is my "authentication code":
function doGet(e){
if(typeof e.parameter.code !== 'undefined') {
var code = e.parameter.code;
getAccessToken(code);
}
return ContentService.createTextOutput('someThink..');
}
function getAccessToken(code){
var API_TOKEN_URL = 'https://discordapp.com/api/oauth2/token'
var CLIENT_ID = 'XYZ'
var CLIENT_SECRET = 'XYZ'
var REDIRECT_URI = 'https://script.google.com/macros/s/AKfycbyyt9-FiVv0zXOr8p8pMfojwEs2AXvBftVN1xdWeU3UQ1xgURD/exec'
data = {
'client_id': CLIENT_ID,
'client_secret': CLIENT_SECRET,
'grant_type': 'authorization_code',
'code': code,
'redirect_uri': REDIRECT_URI,
'scope': 'identify'
}
header = {
'method' : 'post',
'Content-Type': 'application/x-www-form-urlencoded',
'payload' : data
}
var result = UrlFetchApp.fetch(API_TOKEN_URL, header);
if (result.getResponseCode() == 200) {
var params = JSON.parse(result.getContentText());
Logger.log(params.access_token); // all is fine
getUser(params.access_token, params.token_type)
}
}
And this code is my API request:
function getUser(accessToken, token_type){
var API_USERS_URL = 'https://discordapp.com/api/users/#me';
header2 = {
'method' : 'GET',
'Authorization': token_type + ' ' + accessToken,
// I tested all of them
// 'followRedirects' : true,
// 'muteHttpExceptions': true,
// 'Content-Type': 'application/json',
// 'Content-Type': 'application/x-www-form-urlencoded',
}
var resultUsers = UrlFetchApp.fetch(API_USERS_URL, header2); // ERROR HERE !
if (resultUsers.getResponseCode() == 200) {
var paramsUser = JSON.parse(result.getContentText());
Logger.log(paramsUser);
}
}
I accept the connection with discord with the same SCOPES: identify.
I tried so hard but I don't succeed. Every time the same error:
{"code": 0, "message": "401: Unauthorized"}

Answer 1

You're sending the header as the params/options parameter to UrlFetchApp.fetch(). Send the header as the header parameter in options:
var resultUsers = UrlFetchApp.fetch(API_USERS_URL,{headers: header2});