This 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.
property of the
Request interface contains the context of the Request
defines what sort of resource is being fetched. This has been replaced by the
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
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.
var myContext = request.context;
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
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