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Cache buster

A random value added to a tag or pixel URL so caches never serve a stale response.

Without a cache buster, a player or CDN can return the same ad or swallow a tracking call. It is the simplest macro and the most often forgotten.

Without/px?e=impcachednot countedlost eventsWith/px?e=imp&cb=1739…uniquecountedevery call recorded
Without a fresh value, a cache can return the same ad or swallow a tracking call. With one, every call is new.