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Comment: We just shipped support for the ugliest part of HTTP: Vary Simon Willison’s Weblog Subscribe 23rd September 2026 Comment My comment on We just shipped support for the ugliest part of HTTP: Vary — Hacker News I've been wanting this from Cloudflare for years. The classic problem here is if you do that thing where user agents that send "accept: text/html" get HTML, while user agents that don't get JSON or some other format. This used to be impossible to deploy behind Cloudflare caching, because they ignored the Vary header on anything other than images - so you risked caching the JSON version and then serving it up to someone who was expecting HTML. (Independent of the Cloudflare feature I ended up deciding never to use that pattern, because I prefer having URL that predictably returns HTML or JSON - I add a .json suffix to my apps to serve JSON instead.) Recent articles 2026 in LLMs (so far) - 27th September 2026 Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war - 22nd September 2026 Jev introduces a new shape of LLM - System One, aka Decision Models - 21st September 2026 This is a beat by Simon Willison, posted on 23rd September 2026. http 125 cloudflare 34 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026