How to understand CacheResponseBytes bigger than EdgeResponseBytes

EdgeResponseBytes - Number of bytes returned by the edge to the client
CacheResponseBytes - Number of bytes returned by the cache
and EdgeResponseBytes should be the egress/total bandwidth

Yes. The size of CacheResponseBytes is usually bigger than EdgeResponseBytes is due to compression being done when returning the response from Cloudflare to the visitor (most probably gzip or Brotli).

You may also take a look at EdgeResponseCompressionRatio field.

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