I am trying to add a reuqest header element to prevent using cloudfront url without this parameter. Here is my fetching

    fetch(url, {
        method: 'GET',
        headers: {
             "header":value
        }
    }).then(res => res.blob())
        .then(blob => {
            const urlObject = URL.createObjectURL(blob);
           //set url to iframe
       })

How can I set this header value and check on AWS side?