Web/API/Request/context

DeprecatedThis feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The deprecated context read-only property of the Request interface contains the context of the Request (e.g., audio, image, iframe). This defines what sort of resource is being fetched. This has been replaced by the destination property.

The context of a request is only relevant in the ServiceWorker API; a service worker can make decisions based on whether the URL is for an image, or an embeddable object such as a <video>, iframe, etc.

Note: You can find a full list of the different available contexts including associated context frame types, CSP directives, and platform feature examples in the Fetch spec request context section.

Syntax

var myContext = request.context;

Value

A RequestContext value.

Example

In the following snippet, we create a new request using the Request.Request() constructor (for an image file in the same directory as the script), then save the request context in a variable:

var myRequest = new Request('flowers.jpg');
var myContext = myRequest.context; // returns the empty string by default

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
`context` Experimental'Deprecated'Non-standard'	Chrome No support 42 — 46	Edge ?	Firefox No support 39 — 42 Notes' No support 39 — 42 Notes' Notes' see bug 1188062 for more information.	IE No support No	Opera No support 28 — 29	Safari No support No	WebView Android No support 42 — 46	Chrome Android No support 42 — 46	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support 4.0 — 5.0

Legend

No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.': Deprecated. Not for use in new websites.
See implementation notes.': See implementation notes.