This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The clone() method of the Request interface creates a copy of the current Request object.

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.)


var newRequest = request.clone();



Return value

A Request object, which is an exact copy of the Request that clone() was called on.


In the following snippet, we create a new request using the Request.Request() constructor (for an image file in the same directory as the script), then clone the request.

var myRequest = new Request('flowers.jpg');
var newRequest = myRequest.clone(); // a copy of the request is now stored in newRequest


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42
39 (39)
No support


No support
Feature Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support No support No support No support No support No support

[1] This feature is implemented behind a preference.

See also

Document Tags and Contributors

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