Duck.com domain name transfer hammered NamePros servers so hard that it singlehandedly uncovered a fairly obscure bug in Nginx's FastCGI caching. It's gone unnoticed for years, including during rigorous load testing.<p>Preliminary evidence suggests that fastcgi_cache_key doesn't handle $cookie_* variables correctly. If the cookie doesn't exist, it seems to result in a unique key every time. (The workaround was to assign the $cookie_* variable to another variable and then use that in fastcgi_cache_key.)<p>If anyone is curious what sort of increase in traffic you should expect from a link to your site appearing on HN, NamePros is getting about 230 additional backend requests per second--that doesn't include anything cached by Cloudflare.<p>Live Monitor: <a href="https://www.nameprosstatus.com" rel="nofollow">https://www.nameprosstatus.com</a><p>source: <a href="https://news.ycombinator.com/item?id=18665292" rel="nofollow">https://news.ycombinator.com/item?id=18665292</a>
I appreciate the interest, but this is definitely premature. I still haven't been able to reproduce it in controlled tests.
As I said in the thread to which you linked, I'll follow up once I've fully investigated.