What is hard to understand about a CDN is not “it can cache files.” It is that it moves user access points, cache layers, and origin protection out to the network edge. As a result, the first-packet time for the same URL may differ a lot across regions, the origin may be healthy while some users still see old content, and when image or video traffic rises, the first thing to saturate is often not the CPU but the cross-region bandwidth and origin fetch path.
Read MoreThe lock icon in the browser address bar is not just saying “this connection is encrypted”. HTTPS has to handle identity verification, key negotiation, transport protection, and handshake latency, and it has to do that at Internet scale.
HTTPS is often broken into separate topics like certificates, cipher suites, HTTP/3, and QUIC, and then only a pile of terms is left. Once the main line is pulled back together, the structure becomes clear: HTTPS is essentially HTTP over TLS. What matters is not that HTTP changed, but that HTTP now runs over a secure channel with authentication and key negotiation.