The cited account describes the previous constraint: behind Cloudflare caching, a URL that returned HTML for Accept: text/html and JSON otherwise could cache the wrong representation. The change makes header-selected representations newly practical to evaluate at the CDN layer.
Raw SignalSep 28, 20261 min read1 source
We just shipped support for the ugliest part of HTTP: Vary
In one minute
Cloudflare has reportedly shipped support for HTTP `Vary` caching.