Using 444

[Bernard Rosset]

> Again thanks, I had tried various 'location' lines such as
>      limit_req_zone $binary_remote_addr zone=mylimit:5m rate=1r/s;
>      limit_req zone=mylimit burst=5 nodelay;
> 
> without success... obviously haven't fully understood

I would suggest to read 
https://freenginx.org/en/docs/http/ngx_http_limit_req_module.html again; 
sometimes details only "click" after on a n-th read.

You mentioned 250k requests/day, but you did not characterise the 
population spread.
My concern there would be if you 5 mebibytes storage is enough to handle 
all the IP addresses you're trying to rate-limit: per documentation 
(calculus details in there), one mebibyte stores either 16k IPv4 or 8k IPv6.
Overflow is dealt with LRU.
-- 
Bernard Rosset
https://rosset.net/
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