function getTumblrAuthHeader(url, method) {
    const oauth = new OAuth('https://www.tumblr.com/oauth/request_token', 'https://www.tumblr.com/oauth/access_token', process.env.TUMBLR_KEY, process.env.TUMBLR_SECRET, '1.0A', null, 'HMAC-SHA1');
    return oauth.authHeader(url, token.accessToken, token.tokenSecret, method);
  }
GET /api/tumblr
Tumblr API example (Authenticated request using OAuth 1.0a).