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 read-only redirected property of the Response interface indicates whether or not the response is the result of a request you made which was redirected.
Relying on redirected to filter out redirects makes it easy for a forged redirect to prevent your content from working as expected. Instead, you should actually instead do the filtering when you call fetch(). See the example Disallowing redirects, which shows this being done.
Syntax
var isRedirected = Response.redirected;
Value
A Boolean which is true if the response indicates that your request was redirected.
Examples
Detecting redirects
Checking to see if the response comes from a redirected request is as simple as checking this flag on the Response object. In the code below, a textual message is inserted into an element when a redirect occurred during the fetch operation. Note, however, that this isn't as safe as outright rejecting redirects if they're unexpected, as described under Disallowing redirects below.
fetch("awesome-picture.jpg").then(function(response) {
let elem = document.getElementById("warning-message-box");
if (response.redirected) {
elem.innerHTML = "Unexpected redirect";
} else {
elem.innerHTML = "";
}
return response.blob();
}).then(function(imageBlob) {
let imgObjectURL = URL.createObjectURL(imageBlob);
document.getElementById("img-element-id").src = imgObjectURL;
});
Disallowing redirects
Because using redirected to manually filter out redirects can allow forgery of redirects, you should instead set the redirect mode to "error" in the init parameter when calling fetch(), like this:
fetch("awesome-picture.jpg", { redirect: "error" }).then(function(response) {
return response.blob();
}).then(function(imageBlob) {
let imgObjectURL = URL.createObjectURL(imageBlob);
document.getElementById("img-element-id").src = imgObjectURL;
});
Specifications
| Specification | Status | Comment |
|---|---|---|
| Fetch The definition of 'redirected' in that specification. |
Living Standard | Initial definition |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | ? | 49 (49) |
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 | 49.0 (49) | ? | No support | ? | ? | ? |