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This article explains the same‑origin policy, its role in protecting browsers from XSS, CSRF and other attacks, illustrates how origins are defined with protocol, host and port, and details how CORS, simple requests and preflight requests enable controlled cross‑origin communication.
This article explains the browser's Same‑Origin Policy, its role in preventing XSS, CSRF and other attacks, and details how Cross‑Origin Resource Sharing (CORS) works, including simple requests, preflight requests, credential handling, and provides a complete request flow diagram.
Cross-Origin Resource Sharing (CORS) extends the Same-Origin Policy by permitting controlled cross‑origin requests through simple and preflight flows, using specific headers and credential rules, thereby balancing web security against threats like XSS, CSRF, and injection attacks while enabling safe resource sharing.
This article explains the browser's Same-Origin Policy, its impact on DOM, data, and network access, and how Cross-Origin Resource Sharing (CORS) and preflight requests enable controlled cross-origin communication while preserving security.