Is this blank page a CloudFlare thing ? Maybe a block?

I use an external monitoring service that checks my site every few minutes; This service keeps failing and it shows me that this is the reply received from server:


I want to know if this is something speciffic to Cloudflare, maybe a page returned to some bots or to some blocked IPs.

I am sure i seen this before, but I cannot remember if this was returned by

  • Cloudflare
  • the Nginx on my server
  • Apache on my server

Requests go trough all these 3 but I suspect it is returned by Cloudflare because I canont find any errors or problems on my server (logs, etc).

Also, that request goes trough OK when same service checks from another location, but only from Europe it often receives this empty tags reply.

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