I understand having multiple proxies, but it seems a bit odd to have more proxy servers than web servers, no? Do they also do caching so that of the up-to 4,000

I understand having multiple proxies, but it seems a bit odd to have more proxy servers than web servers, no? Do they also do caching so that of the up-to 4,000 requests/second, a lot of them never reach the web servers? Presumably the Python code is more resource intensive than HAProxy.