Baseline Widely available *
Note: This feature is available in Web Workers.
The mode read-only property of the Request interface contains the mode of the request (e.g., cors, no-cors, same-origin, or navigate.) This is used to determine if cross-origin requests lead to valid responses, and which properties of the response are readable.
To construct a request with a specific mode, pass the desired value as the RequestInit.mode option to the Request.Request() constructor.
Note that setting particular modes, especially no-cors, places restrictions on the request methods and headers that may be used, and prevents JavaScript from accessing the response headers or body. See the documentation for RequestInit.mode for more details.
One of the following values:
same-origin
Disallows cross-origin requests. If a request is made to another origin with this mode set, the result is an error.
no-cors
Disables CORS for cross-origin requests. The response is opaque, meaning that its headers and body are not available to JavaScript.
cors
If the request is cross-origin then it will use the Cross-Origin Resource Sharing (CORS) mechanism.
navigate
A mode for supporting navigation. The navigate value is intended to be used only by HTML navigation. A navigate request is created only while navigating between documents.
Requests can be initiated in a variety of ways, and the mode for a request depends on the particular means by which it was initiated.
For example, when a Request object is created using the Request() constructor, the value of the mode property for that Request is set to cors.
However, for requests created other than by the Request() constructor, no-cors is typically used as the mode; for example, for embedded resources where the request is initiated from markup, unless the crossorigin attribute is present, the request is in most cases made using the no-cors mode â that is, for the <link> or <script> elements (except when used with modules), or <img>, <audio>, <video>, <object>, <embed>, or <iframe> elements.
In the following snippet, we create a new request using the Request() constructor (for an image file in the same directory as the script), then save the request mode in a variable:
const myRequest = new Request("flowers.jpg");
const myMode = myRequest.mode; // returns "cors" by default
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