axios library

axios.post('/user', {
    firstName: 'Fred',
    lastName: 'Flintstone'
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });

const res = await axios.put('https://httpbin.org/put', { hello: 'world' });

res.data.headers['Content-Type']; // application/json;charset=utf-8

<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>