🌐 What is CORS, and Why Does it Matter for Cross-Origin Requests? 🌐

·January 21, 2025

CORS (Cross-Origin Resource Sharing) is a critical browser security mechanism designed to regulate how resources are accessed and shared between different origins, where an origin is defined by the combination of protocol, domain, and port. It enforces the same-origin policy, a security measure that prevents web pages from making unauthorized requests to a different origin, thereby safeguarding sensitive user data. CORS allows servers to define specific origins that are permitted to access their resources by including headers like `Access-Control-Allow-Origin` in their responses. This feature is essential for preventing malicious activities such as Cross-Site Request Forgery (CSRF) while enabling legitimate cross-origin requests, such as fetching data from third-party APIs or building integrations between systems. By balancing security and flexibility, CORS plays a vital role in modern web application development, ensuring secure and efficient communication across origins.

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