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// Same-origin: cookies sent by default await fetch("/api/data"); // Cross-origin with cookies await fetch("https://api.example.com/data", { credentials: "include" }); // No credentials (default for cross-origin) await fetch("https://api.example.com/data", { credentials: "omit" }); // Server must respond with: Access-Control-Allow-Origin: https://your-site.com // Access-Control-Allow-Credentials: true
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