Response.headers

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

Syntax

var myHeaders = response.headers;

Value

A Headers object.

Example

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 Body.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 value to the console.

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

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

fetch(myRequest).then(function(response) {
  console.log(response.headers); // returns a Headers{} object
  response.blob().then(function(myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });
});

Specifications

Specification	Status	Comment
Fetch The definition of 'headers' in that specification.	Living Standard	Initial definition

Browser compatibility

[1] This feature is implemented behind a preference.

See also

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