Request.context

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 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 This has been replaced by the destination property.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
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
ExperimentalDeprecatedNon-standard
Chrome No support 42 — 46Edge ? Firefox No support 39 — 42
Notes
No support 39 — 42
Notes
Notes see bug 1188062 for more information.
IE No support NoOpera No support 28 — 29Safari No support NoWebView Android No support 42 — 46Chrome Android No support 42 — 46Edge Mobile ? Firefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung 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.
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.

See also

Document Tags and Contributors

Last updated by: sideshowbarker,