CODE EXAMPLE FOR JAVASCRIPT

async/await

async function handler (req, res) {
  let response;
  try {
    response = await request('https://user-handler-service')  ;
  } catch (err) {
    logger.error('Http error', err);
    return res.status(500).send();
  }

  let document;
  try {
    document = await Mongo.findOne({ user: response.body.user });
  } catch (err) {
    logger.error('Mongo error', err);
    return res.status(500).send();
  }

  executeLogic(document, req, res);
}