Request

The Request interface of the Fetch API represents a resource request.

You can create a new Request object using the Request() constructor, but you are more likely to encounter a Request object being returned as the result of another API operation, such as a service worker FetchEvent.request.

Constructor

Request()

Creates a new Request object.

Properties

Request.cache Lecture seule

Contains the cache mode of the request (e.g., default, reload, no-cache).

Request.context Lecture seule

Contains the context of the request (e.g., audio, image, iframe, etc.)

Request.credentials Lecture seule

Contains the credentials of the request (e.g., omit, same-origin, include). The default is same-origin.

Request.destination Lecture seule

Returns a string from the RequestDestination enum describing the request's destination. This is a string indicating the type of content being requested.

Request.headers Lecture seule

Contains the associated Headers object of the request.

Request.integrity Lecture seule

Contains the subresource integrity value of the request (e.g., sha256-BpfBw7ivV8q2jLiT13fxDYAe2tJllusRSZ273h2nFSE=).

Request.method Lecture seule

Contains the request's method (GET, POST, etc.)

Request.mode Lecture seule

Contains the mode of the request (e.g., cors, no-cors, same-origin, navigate.)

Request.redirect Lecture seule

Contains the mode for how redirects are handled. It may be one of follow, error, or manual.

Request.referrer Lecture seule

Contains the referrer of the request (e.g., client).

Request.referrerPolicy Lecture seule

Contains the referrer policy of the request (e.g., no-referrer).

Request.url Lecture seule

Contains the URL of the request.

Request implements Body, so it also inherits the following properties:

body Lecture seule

A simple getter used to expose a ReadableStream of the body contents.

bodyUsed Lecture seule

Stores a Boolean that declares whether the body has been used in a response yet.

Methods

Request.clone()

Creates a copy of the current Request object.

Request implements Body, so it also has the following methods available to it:

Body.arrayBuffer()

Returns a promise that resolves with an ArrayBuffer representation of the request body.

Body.blob()

Returns a promise that resolves with a Blob representation of the request body.

Body.formData()

Returns a promise that resolves with a FormData representation of the request body.

Body.json()

Returns a promise that resolves with a JSON representation of the request body.

Body.text()

Returns a promise that resolves with an USVString (text) representation of the request body.

Examples

In the following snippet, we create a new request using the Request() constructor (for an image file in the same directory as the script), then return some property values of the request:

const request = new Request('https://www.mozilla.org/favicon.ico');

const URL = request.url;
const method = request.method;
const credentials = request.credentials;

You could then fetch this request by passing the Request object in as a parameter to a WindowOrWorkerGlobalScope.fetch() call, for example:

fetch(request)
  .then(response => response.blob())
  .then(blob => {
    image.src = URL.createObjectURL(blob);
  });

In the following snippet, we create a new request using the Request() constructor with some initial data and body content for an api request which need a body payload:

const request = new Request('https://example.com', {method: 'POST', body: '{"foo": "bar"}'});
 
const URL = request.url;
const method = request.method;
const credentials = request.credentials;
const bodyUsed = request.bodyUsed;

You could then fetch this api request by passing the Request object in as a parameter to a WindowOrWorkerGlobalScope.fetch() call, for example and get the response:

fetch(request)
  .then(response => {
    if (response.status === 200) {
      return response.json();
    } else {
      throw new Error('Something went wrong on api server!');
    }
  })
  .then(response => {
    console.debug(response);
    // ...
  }).catch(error => {
    console.error(error);
  });

Specifications

Browser compatibility

See also

• ServiceWorker API
• HTTP access control (CORS)
• HTTP