aa.js

export default function handler(req, res) {
fetch("https://full-mantis-14289-us1-rest-kafka.upstash.io/produce/newtopic/MESSAGE", {
  headers: {
    Authorization: "Basic Wm5Wc2JDMXRZVzUwYVhNdE1UUXlPVDlUR2szT0ZkabXRvYWxYbm9ldTlUalFG5qZlNLd1X3lBcTRUUEdkOWM2SmJxZlE9PQ=="
  }
  }).then(response => response.json())
  .then(data => {
    console.log(data)
  });
  
  res.status(200).json({ name: 'John Doe' })
}