Cloudflare is a CDN (content delivery network) with a security layer. Once Cloudflare service is established for a domain, its web traffic is routed through Cloudflare’s global network.
Cloudflare’s network stores a copy of static files on servers that are geographically closer to web visitors, which means they are delivered more quickly than before. Cloudflare caches resources such as CSS, JavaScript, and images. Cloudflare’s technology automatically determines which resources to cache based on file extensions, so no configuration is necessary. Cloudflare also does compression for every request.
Cloudflare’s network also blocks threats and limits abusive bots before they hit the server, which means less wasted bandwidth and server resources.
The HTTP ports that Cloudflare supports are 80, 8080, 8880, 2052, 2082, 2086, and 2095.
The HTTPS ports that Cloudflare supports are 443, 2053, 2083, 2087, 2096, and 8443.