Walk an SSRF Image Fetcher
Choose SSRF controls for user-supplied URLs, network egress, redirects, and response handling.
Server as browser The backend fetches user-provided image URLs from inside the production VPC to create thumbnails. If users control where the server connects, they may reach internal services they cannot access directly. The framework Constrain destination, verify after resolution, restrict egress SSRF prevention needs both application checks and network boundaries. URL parsing alone is too fragile. Treat every user-provided URL as a request to spend your server's network authority. Bad instinct Block the string localhost and assume the URL is safe. The fetcher loses the ability to become a tunnel into private infrastructure. 01 Need fetch? 02 Destination 03…
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