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Response: type property

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".
  • 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.
  • opaqueredirect: The fetch request was made with redirect: "manual". The Response's status is 0, headers are empty, body is null and trailer is empty.

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

Value

A ResponseType string indicating the type of the response.

Examples

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 Response.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.

js

const myImage = document.querySelector("img");

const myRequest = new Request("flowers.jpg");

fetch(myRequest)
  .then((response) => {
    console.log("response.type =", response.type); // response.type = 'basic'
    return response.blob();
  })
  .then((myBlob) => {
    const objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
type 40 14 39 No 27 10.1 40 40 39 27 10.3 4.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Response/type