This week in caching: push CDN vs pull CDN
Older distinction, still decides your origin load:
— Pull (origin-pull): CDN fetches from your origin on first miss, caches, serves. Zero upload step, content auto-updates when origin does. The default for 95% of sites.
— Push: you upload assets to the CDN ahead of time; origin is never hit. Worth it for huge files (video, large downloads) where even one origin pull is expensive, or origins that can't take traffic spikes.
— The pull gotcha: a viral cold object triggers many simultaneous origin fetches before the cache fills — 'origin shielding' (a mid-tier cache) collapses that into one fetch. Turn it on if your CDN offers it.
Most people never need push; they need shielding turned on and a sane default TTL.
Bookmark: Cloudflare's 'origin shielding / Tiered Cache' docs — the fix for pull-CDN miss storms.
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This week in caching: push CDN vs pull CDN
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