LuTiao Programming

Sep 24, 2026 · Backend Development

Spring Boot 4.1's InetAddressFilter Finally Blocks SSRF in URL Preview APIs

The article demonstrates how Spring Boot 4.1's new InetAddressFilter.externalAddresses() simplifies SSRF protection for user-supplied URLs, replacing manual IP checks with a centralized HTTP client filter, while also covering URL validation, redirect handling, timeouts, response size limits, and testing strategies to secure link preview and similar features.