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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. 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 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.

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

Specifications

Specification Status Comment
Fetch
The definition of 'context' in that specification.
Living Standard Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42[1] 42 (42)[2]
39 (39)
34[1]
No support

29
28[1]

No support
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support 42[1] No support No support No support No support No support 42[1]

[1] Removed in Chrome 46.

[2] Removed from Firefox as of version 42, until the spec is agreed upon (see bug 1188062 for more information.)

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, jpmedley, Sebastianz, mathiasbynens, kscarfone
 Last updated by: chrisdavidmills,