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Sec-Fetch-Mode header - HTTP | MDN

Sec-Fetch-Mode header

Baseline 2023

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The HTTP Sec-Fetch-Mode fetch metadata request header indicates the mode of the request.

Broadly speaking, this allows a server to distinguish between requests originating from a user navigating between HTML pages, and requests to load images and other resources. For example, this header would contain navigate for top level navigation requests, while no-cors is used for loading an image.

Syntax
Sec-Fetch-Mode: cors
Sec-Fetch-Mode: navigate
Sec-Fetch-Mode: no-cors
Sec-Fetch-Mode: same-origin
Sec-Fetch-Mode: websocket

Servers should ignore this header if it contains any other value.

Directives

Note: These directives correspond to the values in Request.mode.

cors

The request is a CORS protocol request.

navigate

The request is initiated by navigation between HTML documents.

no-cors

The request is a no-cors request (see Request.mode).

same-origin

The request is made from the same origin as the resource that is being requested.

websocket

The request is being made to establish a WebSocket connection.

Examples Using Sec-Fetch-Mode

If a user clicks on a page link to another page on the same origin, the resulting request would have the following headers (note that the mode is navigate):

Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

A cross-site request generated by an <img> element would result in a request with the following HTTP request headers (note that the mode is no-cors):

Sec-Fetch-Dest: image
Sec-Fetch-Mode: no-cors
Sec-Fetch-Site: cross-site
Specifications Browser compatibility See also

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