Ensure all user-supplied input is treated as untrusted. Use prepared statements for database queries to completely neutralize SQL injection, and enforce strict input filtering and output encoding to eliminate XSS risks. Conclusion
While robots.txt does not prevent malicious actors from accessing files, it stops legitimate search engine crawlers from indexing sensitive installation paths or administrative directories. User-agent: * Disallow: /lvappl/ Disallow: /guestbook/ Use code with caution. 4. Deprecate Legacy Technologies Ensure all user-supplied input is treated as untrusted