https://www.xbcatm.com/tags/http/Illustrated field notes on HTTP, DNS, TLS, Caddy, SSH, releases, and recovery.Hugoen-ushttps://www.xbcatm.com/notes/cache-headers-are-a-contract-with-two-clocks/Sat, 22 Aug 2026 00:00:00 +0000https://www.xbcatm.com/notes/cache-headers-are-a-contract-with-two-clocks/Choose freshness and revalidation rules from how often a representation can change.https://www.xbcatm.com/notes/compression-changes-the-selected-http-representation/Sat, 22 Aug 2026 00:00:00 +0000https://www.xbcatm.com/notes/compression-changes-the-selected-http-representation/Treat content encoding, validators, and Vary as one observable response contract.https://www.xbcatm.com/notes/redirects-and-error-codes-should-preserve-the-story/Sat, 22 Aug 2026 00:00:00 +0000https://www.xbcatm.com/notes/redirects-and-error-codes-should-preserve-the-story/Use permanent redirects and absence codes to describe what happened, not to hide a broken route.