Feature idea: retrieve set_real_ip_from (HttpRealipModule) from a text file online

[Lorenzo Raffio]

What about adding the possibility to retrieve a list of set_real_ip_from
from a text file online? I'm thinking about CloudFlare, that provides this
2 files (plain text): https://www.cloudflare.com/ips-v4 and
https://www.cloudflare.com/ips-v6

It could be useful also for other big projects where nginx is used as proxy.
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