Server-Side Request Forgery: allowlisting the destination of a server-side fetch, when re-resolution between check and connect matters, redirect and scheme bypasses, parsers that fetch on their own (XXE, SVG, HTML-to-PDF), cloud metadata, and keeping the response from becoming an oracle. Use when fe
Server-Side Request Forgery: allowlisting the destination of a server-side fetch, when re-resolution between check and connect matters, redirect and scheme bypasses, parsers that fetch on their own (XXE, SVG, HTML-to-PDF), cloud metadata, and keeping the response from becoming an oracle. Use when fetching a client-supplied URL, wiring webhooks, image proxies, PDF or preview renderers, or reviewing