Error 1000 by Cloudflare?

My static file proxy p.rst.im got an error sometime, saying:

Error 1000
DNS points to prohibited IP

I tried to tcpdump on port 80

And I found some header added by cloudflare:

Cloudflare might treat it infinitely loop, so I remove these headers on nginx:

Now, what caused it:

Here is how I get to these files:

Since I have that proxy on my VPS, it works like:

It IS a loop.

Error 1000 by Cloudflare? by @sskaje: https://sskaje.me/2016/08/error-1000-cloudflare/

Cloudflare IP Ranges

Official list: https://www.cloudflare.com/ips/

You can also query from radb:

BTW: I only add 104.16.0.0/12 in my route collection.

Cloudflare IP Ranges by @sskaje: https://sskaje.me/2016/07/cloudflare-ip-ranges/

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