react fetch browser does not set content type code example

Example 1: javascript fetch api get

fetch('http://example.com/movies.json')
  .then(response => response.json())
  .then(data => console.log(data));

Example 2: fetch suntax

fetch('http://example.com/movies.json')
  .then((response) => {
    return response.json();
  })
  .then((data) => {
    console.log(data);
  });