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CDN caching limitations

Judgments in this source concerning CDN caching limitations. Explora 1 punto de vista con evidencias de 1 fuente.

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Contenido actualizado: 1 oct 2026

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Simon Willison

Cloudflare previously ignored Vary for non-image responses

Before the new feature, Cloudflare ignored the Vary header on responses other than images, risking incorrect cache sharing—e.g., caching a JSON response and serving it to a client expecting HTML.

Comment: We just shipped support for the ugliest part of HTTP: Vary23 sept 2026

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Simon Willison·23 sept 2026

Comment: We just shipped support for the ugliest part of HTTP: Vary

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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.

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23 sept 2026ARTÍCULO

Comment: We just shipped support for the ugliest part of HTTP: Vary

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