This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
mode read-only property of the
Request interface contains the mode of the request (e.g.,
navigate.) This is used to determine if cross-origin requests lead to valid responses, and which properties of the response are readable:
same-origin— If a request is made to another origin with this mode set, the result is simply an error. You could use this to ensure that a request is always being made to your origin.
no-cors— Prevents the method from being anything other than
Response. This ensures that ServiceWorkers do not affect the semantics of the Web and prevents security and privacy issues arising from leaking data across domains.
cors— Allows cross-origin requests, for example to access various APIs offered by 3rd party vendors. These are expected to adhere to the CORS protocol. Only a limited set of headers are exposed in the
Response, but the body is readable.
navigate— A mode for supporting navigation. The
navigatevalue is intended to be used only by HTML navigation. A navigate request is created only while navigating between documents.
var myMode = request.mode;
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 mode in a variable:
var myRequest = new Request('flowers.jpg'); var myMode = myRequest.mode; // returns "cors" by default
The definition of 'mode' in that specification.
|Living Standard||Initial definition|
|Feature||Chrome||Edge||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||42.0||(Yes)||39 (39)||No support||
||49.0||?||46 (46)||No support||?||No support|
|Feature||Android||Android Webview||Edge||Firefox Mobile (Gecko)||Firefox OS (Gecko)||IE Phone||Opera Mobile||Safari Mobile||Chrome for Android|
|Basic support||No support||49.0||(Yes)||No support||No support||No support||No support||No support||49.0|
||No support||No support||?||No support||No support||No support||No support||No support||49.0|