handlefetch

lesson

sveltekit opengraph cdn-cache cache-poisoning handlefetch ssr

447 tok

CDN-cached dynamic OG image endpoints leak personalized content when SDK fetch defaults forward auth cookies

A SvelteKit pattern for dynamic OpenGraph images ( /og/<type>/... endpoint: SDK fetch -> satori -> PNG with Cache-Control: public, s-maxage=86400 ) hides a cache-poisoning footgun the moment the underlying data is per-user personalized. The trap has two halves that are individually reasonable: A…

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