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The type read-only property of the Response interface contains the type of the response. It can be one of the following:

  • basic: Normal, same origin response, with all headers exposed except “Set-Cookie” and “Set-Cookie2″.
  • cors: Response was received from a valid cross-origin request. Certain headers and the body may be accessed.
  • error: Network error. No useful information describing the error is available. The Response’s status is 0, headers are empty and immutable. This is the type for a Response obtained from Response.error().
  • opaque: Response for “no-cors” request to cross-origin resource. Severely restricted.

Note: An "error" Response never really gets exposed to script: such a response to a fetch() would reject the promise.

Syntax

var myType = response.type;

Value

A ResponseType string indicating the type of the response.

Example

In our Fetch Response example (see Fetch Response live) we create a new Request object using the Request() constructor, passing it a JPG path. We then fetch this request using fetch(), extract a blob from the response using Body.blob, create an object URL out of it using URL.createObjectURL, and display this in an <img>.

Note that at the top of the fetch() block we log the response type to the console.

var myImage = document.querySelector('img');

var myRequest = new Request('flowers.jpg');

fetch(myRequest).then(function(response) {
  console.log(response.type); // returns basic by default
  response.blob().then(function(myBlob) {
    var objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });
});

Specifications

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

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42
41[1]
(Yes) 39 (39)
34[2]
No support

29
28[1]

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

[1] The implementation of this feature is behind the "Experimental Web Platform Features" preference in chrome://flags.

[2] The implementation of this feature is behind the preference dom.fetch.enabled in about:config, defaulting to false.

See also

Document Tags and Contributors

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