In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request.Īn example of a cross-origin request: the front-end JavaScript code served from uses XMLHttpRequest to make a request for. CORS also relies on a mechanism by which browsers make a "preflight" request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. Experimental Feature-Policy: xr-spatial-trackingĬross-Origin Resource Sharing ( CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources.Experimental Non-standard Feature-Policy: unsized-media.Experimental Non-standard Feature-Policy: unoptimized-images. Experimental Non-standard Feature-Policy: sync-xhr.Experimental Feature-Policy: speaker-selection.Experimental Feature-Policy: screen-wake-lock.
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