Web/API/Request/Request

The Request() constructor creates a new Request object.

Syntax

var myRequest = new Request(input[, init]);

Parameters

input: Defines the resource that you wish to fetch. This can either be:

A USVString containing the direct URL of the resource you want to fetch. A Request object, effectively creating a copy. Note the following behavioural updates to retain security while making the constructor less likely to throw exceptions:

If this object exists on another origin to the constructor call, the Request.referrer is stripped out. If this object has a Request.mode of navigate, the mode value is converted to same-origin.

init Optional: An options object containing any custom settings that you want to apply to the request. The possible options are:

method

The request method, e.g., GET, POST. The default is GET.
headers: Any headers you want to add to your request, contained within a Headers object or an object literal with ByteString values.
body: Any body that you want to add to your request: this can be a Blob, BufferSource, FormData, URLSearchParams, USVString, or ReadableStream object. Note that a request using the GET or HEAD method cannot have a body.
mode: The mode you want to use for the request, e.g., cors, no-cors, same-origin, or navigate. The default is cors.
credentials: The request credentials you want to use for the request: omit, same-origin, or include. The default is same-origin.
cache: The cache mode you want to use for the request.
redirect: The redirect mode to use: follow, error, or manual. The default is follow.
referrer: A USVString specifying no-referrer, client, or a URL. The default is about:client.
integrity: Contains the subresource integrity value of the request (e.g., sha256-BpfBw7ivV8q2jLiT13fxDYAe2tJllusRSZ273h2nFSE=).

Errors

Type	Description
`TypeError`	Since Firefox 43, `Request()` will throw a TypeError if the URL has credentials, such as http://user:[email protected].

Example

In our Fetch Request example (see [[../../../../../../../mdn.github.io/fetch-examples/fetch-request/index|Fetch Request live]]) we create a new Request object using the constructor, then fetch it using a GlobalFetch.fetch call. Since we are fetching an image, we run Body.blob on the response to give it the proper MIME type so it will be handled properly, then create an Object URL of it and display it in an <img> element.

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

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

fetch(myRequest).then(function(response) {
  return response.blob();
}).then(function(response) {
  var objectURL = URL.createObjectURL(response);
  myImage.src = objectURL;
});

In our Fetch Request with init example (see [[../../../../../../../mdn.github.io/fetch-examples/fetch-request-with-init/index|Fetch Request init live]]) we do the same thing except that we pass in an init object when we invoke fetch():

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

var myHeaders = new Headers();
myHeaders.append('Content-Type', 'image/jpeg');

var myInit = { method: 'GET',
               headers: myHeaders,
               mode: 'cors',
               cache: 'default' };

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

fetch(myRequest).then(function(response) {
  ... 
});

Note that you could also pass the init object into the fetch call to get the same effect, e.g.:

fetch(myRequest,myInit).then(function(response) {
  ...
});

You can also use an object literal as headers in init.

var myInit = { method: 'GET',
               headers: {
                   'Content-Type': 'image/jpeg'
               },
               mode: 'cors',
               cache: 'default' };

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

You may also pass a Request object to the Request() constructor to create a copy of the Request (This is similar to calling the clone() method.)

var copy = new Request(myRequest);

Note: This last usage is probably only useful in ServiceWorkers.

Specifications

Specification	Status	Comment
FetchThe definition of 'Request()' in that specification.	Living Standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`Request()` constructor Experimental'	Chrome Full support 41 Notes' Full support 41 Notes' Notes' From Chrome 47, default values for the `init` argument's properties changed. `mode` defaults to `same-origin` (from `no-cors`). `credentials` defaults to `include` (from `same-origin`). `redirect` defaults to `follow` (from `manual`).	Edge Full support 15	Firefox Full support 39 Full support 39 Full support 34 Disabled' Disabled' From version 34: this feature is behind the `dom.fetch.enabled` preference. To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the `Experimental Web Platform Features` preference.	Safari Full support 10.1	WebView Android Full support 42 Notes' Full support 42 Notes' Notes' From WebView 47, default values for the `init` argument's properties changed. `mode` defaults to `same-origin` (from `no-cors`). `credentials` defaults to `include` (from `same-origin`). `redirect` defaults to `follow` (from `manual`).	Chrome Android Full support 41 Notes' Full support 41 Notes' Notes' From Chrome 47, default values for the `init` argument's properties changed. `mode` defaults to `same-origin` (from `no-cors`). `credentials` defaults to `include` (from `same-origin`). `redirect` defaults to `follow` (from `manual`).	Firefox Android Full support 39 Full support 39 Full support 34 Disabled' Disabled' From version 34: this feature is behind the `dom.fetch.enabled` preference. To change preferences in Firefox, visit about:config.	Opera Android Full support 29 Full support 29 Full support 28 Disabled' Disabled' From version 28: this feature is behind the `Experimental Web Platform Features` preference.	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0 Full support 4.0 Full support 5.0 Notes' Notes' Some default values for the init parameter changed in Samsung Internet 5.0. See the Properties section for details.
cross-origin `referrer` stripped out and `navigate` mode converted to `same-origin` when constructor created from existing `Request` object. Experimental'	Chrome Full support Yes	Edge Full support 15	Firefox Full support 54	IE No support No	Opera Full support Yes	Safari Full support 10.1	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android No support No	Safari iOS Full support 10.3	Samsung Internet Android Full support Yes
`navigate` mode Experimental'	Chrome Full support 49	Edge Full support 15	Firefox Full support 46	IE No support No	Opera Full support Yes	Safari Full support 10.1	WebView Android No support No	Chrome Android Full support 49	Firefox Android Full support Yes	Opera Android No support No	Safari iOS Full support 10.3	Samsung Internet Android Full support 5.0
Send `ReadableStream` in request body Experimental'	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera ?	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No
`referrer` init option Experimental'	Chrome ?	Edge Full support 15	Firefox Full support 47	IE No support No	Opera Full support Yes	Safari Full support 10.1	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android No support No	Safari iOS Full support 10.3	Samsung Internet Android Full support Yes
Consume response body as a `ReadableStream` Experimental'	Chrome Full support 43	Edge Full support ≤79	Firefox Full support 65 Full support 65 Full support 57 Disabled' Disabled' From version 57: this feature is behind the `dom.streams.enabled` preference (needs to be set to `true`) and the `javascript.options.streams` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera ?	Safari No support No	WebView Android Full support 43	Chrome Android Full support 43	Firefox Android Full support 65 Full support 65 Full support 57 Disabled' Disabled' From version 57: this feature is behind the `dom.streams.enabled` preference (needs to be set to `true`) and the `javascript.options.streams` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android No support No	Safari iOS Full support 10.3	Samsung Internet Android Full support 4.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
See implementation notes.': See implementation notes.
User must explicitly enable this feature.': User must explicitly enable this feature.