Why Empty in content breakdown in the performance?


We just started using Cloudflare. In the performance tab, We could see more empty content in the Content Type Breakdown for our website.What does it mean?
Empty in the content breakdown

And also how about this bandwidth saved. Are these served from Cloudflare server instead of our hosting server?
Bandwidth saved

This means there was no Content-Type or that the type couldn’t be determined. Perhaps error responses, redirects, etc.

Yes, that’s the cache.

Thanks for your update

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