What is CORS?
Blog post from Postman
Cross-Origin Resource Sharing (CORS) is a security standard that allows servers to specify which origins can access their resources, refining the same-origin policy (SOP) that restricts resource access to the same origin as the requesting web application. The SOP ensures that origins must share the same host, scheme, and port to access resources, though it is lenient with certain resources like images and scripts. CORS operates through HTTP request and response headers, enabling servers to grant permission for cross-origin requests, which can be categorized into simple and preflight requests based on their complexity and methods used. CORS enhances security by preventing unauthorized access through explicit permissions, supporting cross-origin authentication, and facilitating API integration, thus allowing secure interaction with external APIs. Implementing CORS effectively involves avoiding cache poisoning by setting appropriate Access-Control-Max-Age durations, explicitly specifying allowed origins, methods, and headers, and ensuring the inclusion of necessary CORS headers to prevent security risks. Proper documentation and secure credential validation are essential to maintain security and provide a reliable developer experience.
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