Is CORS a client-side or server-side mechanism?
Server-side. CORS is configured on the server by including the appropriate headers. The browser enforces it by checking the headers. You cannot 'fix' CORS from the client side (the server must allow your origin).
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More FAQs in What Is CORS in JavaScript?
Cross-Origin Resource Sharing. A browser security mechanism that controls when a web page can make requests to a different origin (protocol + domain + port). The server must include Access-Control-Allow-Origin headers to allow cross-origin requests.
A browser security policy that blocks requests to different origins by default. CORS is the mechanism that allows servers to opt-in to cross-origin requests by including specific headers.
Access-Control-Allow-Origin (which origins are allowed), Access-Control-Allow-Methods (which HTTP methods), Access-Control-Allow-Headers (which custom headers), and Access-Control-Allow-Credentials (for cookies).
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