What's the best way to protect against server-side request forgery (SSRF) attacks?

To protect against SSRF (Server-Side Request Forgery) attacks, remember to validate and sanitize all user-supplied URLs. Also, implement strict input validation that allows only URLs matching specific patterns or domains. You should remember to employ an allowlist approach, where only known and safe domains are permitted. Remember to avoid exposing sensitive internal resources and ensure that server-side requests do not expose internal infrastructure details. Also, use network segmentation and firewalls to limit access from the application server to internal networks. Last but not least, regularly update and patch your web servers and libraries to mitigate known SSRF vulnerabilities.