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.)
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 Response.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;
});
});