Response.redirected

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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 60Edge Full support 16Firefox Full support 49IE No support NoOpera Full support 47Safari No support NoWebView Android Full support 60Chrome Android Full support 60Edge Mobile Full support YesFirefox Android Full support 49Opera Android Full support 47Safari 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.

See also

Document Tags and Contributors

Contributors to this page: fscholz, libbymc, jpmedley, chrisdavidmills, ZeikJT, Sheppy
Last updated by: fscholz,