The most important of these headers is Access-Control-Allow-Origin, which specifies the origins that are allowed to access the resources from the server. The browser will allow certain cross-origin responses based on these extra headers. These headers start with Access-Control. To allow cross-origin requests to be made, some changes need to be made to the server-side code to add extra headers to the HTTP response sent back to the browser client. When a request is made, the browser client adds an Origin header to the request to indicate where the request came from. CORS uses HTTP headers to indicate the origins that a browser should allow resources to be loaded from. To allow resource sharing between a server and a resource at a different origin, the browser uses a mechanism called cross-origin resource sharing (CORS). For example, it prevents malicious JavaScript on an attacker’s website from reading data and interacting with an embedded website in an iFrame that loads a website that the user may be logged in to. It prevents resources, such as API endpoints exposed by a server, from being accessible to a frontend website hosted at a different origin, such as another server. Why does this error happen? The same-origin policy is a browser security measure that restricts resource fetching from different origins. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. Access to fetch at ' from origin '' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
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