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Both image routes sent Cache-Control: public, max-age=31536000, immutable, so a browser or proxy could keep serving an image for a year after its signed or encrypted URL had expired. The header is now built from the request's Expires: max-age is the whole seconds left until the URL expires, never negative, or one year for a URL with no expiry. ToImageRequest now carries an encrypted URL's expiry onto the request, as the image route already does with exp. immutable stays: it only stops revalidation while a copy is fresh, and freshness now ends at the expiry. README.md documents the header. Model: opus-5-5