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With web caching and cache-related services like CDNs and edge services playing an increasingly significant role in the modern Internet, the problem of the weak consistency and coherence provisions in current web protocols is drawing increasing attention. Toward this end, the authors differentiate definitions of consistency and coherence for web-like caching environments, and then present a novel web protocol they call "Basis Token Consistency" (BTC). This protocol allows compliant caches to guarantee strong consistency of content retrieved from supporting servers.
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