Response.clone()

The clone() method of the Response interface creates a clone of a response object, identical in every way, but stored in a different variable.

clone() throws a TypeError if the response Body has already been used. In fact, the main reason clone() exists is to allow multiple uses of Body objects (when they are one-use only.)

Syntax

var response2 = response1.clone();

Parameters

None.

Value

A Response object.

Example

In our Fetch Response clone example (see Fetch Response clone live) we create a new Request object using the Request() constructor, passing it a JPG path. We then fetch this request using fetch(). When the fetch resolves successfully, we clone it, extract a blob from both responses using two Body.blob calls, create object URLs out of the blobs using URL.createObjectURL, and display them in two separate <img> elements.

var image1 = document.querySelector('.img1');
var image2 = document.querySelector('.img2');

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

fetch(myRequest).then(function(response) {
  var response2 = response.clone();

  response.blob().then(function(myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    image1.src = objectURL;
  });

  response2.blob().then(function(myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    image2.src = objectURL;
  });
});

Specifications

Specification Status Comment
Fetch
The definition of 'clone()' in that specification.
Living Standard Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

42

411

Yes

39

342

No

29

283

No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No Yes No No No No

1. From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.

2. From version 34: this feature is behind the dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.

3. From version 28: this feature is behind the Experimental Web Platform Features preference.

See also

Document Tags and Contributors

 Contributors to this page: fscholz, chrisdavidmills, abbycar, Sebastianz, jpmedley, kscarfone
 Last updated by: fscholz,