<ul data-eligibleForWebStory="false"><li>Understanding Same-Origin Policy (SOP) and Cross-Origin Resource Sharing (CORS) is crucial for developers.</li><li>SOP restricts JavaScript access to response body of cross-origin requests; CORS headers allow access.</li><li>Origin defined by protocol, domain, and port; SOP aims to prevent unauthorized access.</li><li>CORS tells browsers which domains can access resources; preflight requests secure complex requests.</li><li>Protecting against unauthorized access and understanding SOP and CORS are essential for web developers.</li></ul>

A Developer's Guide to Same-Origin Policy (SOP) and Cross-Origin Resource Sharing (CORS)

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