Response.headers

The headers read-only property of the Response interface contains the Headers object associated with the response.

A Headers object.

In our Fetch Response example (see Fetch Response live) we create a new Request object using the Request() constructor, passing it a JPG path. We then fetch this request using fetch(), extract a blob from the response using Response.blob, create an object URL out of it using URL.createObjectURL, and display this in an <img>.

Note that at the top of the fetch() block, we log the response headers to the console.

var myImage = document.querySelector('img');

var myRequest = new Request('flowers.jpg');

fetch(myRequest).then(function(response) {
  // for each response header, log an array with header name as key
  console.log(...response.headers);
  response.blob().then(function(myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });
});

• ServiceWorker API
• HTTP access control (CORS)
• HTTP