{"type":"raw_signal","id":"we-just-shipped-support-for-the-ugliest-part-4a76ee","slug":"we-just-shipped-support-for-the-ugliest-part-4a76ee","title":"We just shipped support for the ugliest part of HTTP: Vary","description":"Cloudflare has reportedly shipped support for HTTP `Vary` caching.","retrieval_nugget":"Cloudflare has reportedly shipped support for HTTP `Vary` caching.","observed_at":"2026-09-28","record_date":"2026-09-28","date_kind":"observed_at","why_it_matters":"Cloudflare has reportedly shipped support for HTTP `Vary` caching. 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.","novelty":"notable","verification_level":"source-linked","signal_type":"release","source_platform":"simonwillison.net","topics":[],"entities":[],"related_patterns":[],"source_url":"https://simonwillison.net/2026/Sep/23/hn-49823961","source_urls":["https://simonwillison.net/2026/Sep/23/hn-49823961"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"signal:we-just-shipped-support-for-the-ugliest-part-4a76ee","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/signals/we-just-shipped-support-for-the-ugliest-part-4a76ee/","markdown":"https://newruntime.com/signals/we-just-shipped-support-for-the-ugliest-part-4a76ee.md","json":"https://newruntime.com/signals/we-just-shipped-support-for-the-ugliest-part-4a76ee.json"},"next_reads":[{"type":"collection","path":"/signals/","url":"https://newruntime.com/signals/","title":"Raw Signals","reason":"Open every source-linked raw signal.","media_type":"text/html","json_url":"https://newruntime.com/signals.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}