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This operation performs a simple exchange between the client and the server, using CORS headers to handle the privileges:
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For example, XMLHttpRequest and the Fetch API follow the same-origin policy. įor security reasons, browsers restrict cross-origin HTTP requests initiated from scripts. 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.
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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. Cross-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.