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Amazon CloudFront - Amazon CloudFront is a content delivery web service.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Naxsi - NAXSI means Nginx Anti XSS & SQL Injection.