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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Experimental
Chrome Full support 42
Full support 42
Full support 41
Disabled
Disabled From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.
Edge Full support YesFirefox Full support 39
Full support 39
Full support 34
Disabled
Disabled From version 34: this feature is behind the dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 29
Full support 29
Full support 28
Disabled
Disabled From version 28: this feature is behind the Experimental Web Platform Features preference.
Safari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

Document Tags and Contributors

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