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Editor's pickLearn how to validate user-supplied URLs safely with scheme and host policies, DNS/IP checks, redirect controls, and network egress defenses for fetch features.
Learn how SSRF happens, why DNS and redirects complicate URL checks, and how allowlists, egress controls, and metadata protections reduce risk.
Learn how SSRF works, why private IPs, redirects, DNS rebinding, and cloud metadata matter, and how to design safer server-side URL fetchers.