Sec-Fetch-Mode
source link: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode
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Sec-Fetch-Mode
The 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
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
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
SpecificationFetch Metadata Request Headers (Fetch Metadata)# sec-fetch-mode-header
Browser compatibility
Report problems with this compatibility data on GitHubdesktopmobileChromeEdgeFirefoxInternet ExplorerOperaSafariWebView AndroidChrome AndroidFirefox for AndroidOpera AndroidSafari on iOSSamsung InternetSec-Fetch-ModeLegend
See also
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