Cloudflare ships Vary support in Cache Rules to tame HTTP's 'ugliest' header
threepointone · x · 2026-09-22
Cloudflare now supports the Vary response header in Cache Rules across all plans. Vary tells caches which request headers may affect a response, but ignoring it risks serving wrong bytes while treating every raw value as distinct explodes cache entries. The new feature lets you decide per-header: normalize known negotiation headers, pass exact values through when small differences matter, or bypass cache when variation is too unpredictable.
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