Response.clone()
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use 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 spec changes.
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 <var>response2</var> = <var>response1</var>.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
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 42 41[1] |
39 (39) 34[1] |
Not supported |
29 |
Not supported |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported |
[1] This feature is implemented behind a preference.
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/response/clone