Request()

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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:password@example.com.

Example

In our Fetch Request example (see 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 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
Fetch
The definition of 'Request()' in that specification.
Living Standard

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung 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 15Firefox 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 NoOpera 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 10.1WebView 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 YesOpera 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 10.3Samsung 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 YesEdge Full support 15Firefox Full support 54IE No support NoOpera Full support YesSafari Full support 10.1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android No support NoSafari iOS Full support 10.3Samsung Internet Android Full support Yes
navigate mode
Experimental
Chrome Full support 49Edge Full support 15Firefox Full support 46IE No support NoOpera Full support YesSafari Full support 10.1WebView Android No support NoChrome Android Full support 49Firefox Android Full support YesOpera Android No support NoSafari iOS Full support 10.3Samsung Internet Android Full support 5.0
Send ReadableStream in request body
Experimental
Chrome No support NoEdge ? Firefox No support NoIE No support NoOpera ? Safari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No
referrer init option
Experimental
Chrome ? Edge Full support 15Firefox Full support 47IE No support NoOpera Full support YesSafari Full support 10.1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android No support NoSafari iOS Full support 10.3Samsung Internet Android Full support Yes
Consume response body as a ReadableStream
Experimental
Chrome Full support 43Edge ? 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 NoOpera ? Safari No support NoWebView Android Full support 43Chrome Android Full support 43Firefox 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 NoSafari iOS Full support 10.3Samsung 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.

See also