Reasonable rules for something like HAProxy are not at all prone to errors. Ours aren't even applied by hand. It only has to be made right when the automation m

Reasonable rules for something like HAProxy are not at all prone to errors. Ours aren't even applied by hand. It only has to be made right when the automation module is updated, and that gets tested well before it goes to production. Varnish rules are also not that difficult, but I said nothing of caching reverse proxy. I mentioned Memcached specifically in the context of federating traffic counts across multiple non-caching proxies. Whether an application uses Memcached or not is irrelevant to the proxies.