Indeed, for example Chrome wants to cache DNS results for at least a minute [1]. However, Chrome and Firefox cache the complete DNS/getaddrinfo response, i.e.

Indeed, for example Chrome wants to cache DNS results for at least a minute [1]. However, Chrome and Firefox cache the complete DNS/getaddrinfo response, i.e. all addresses. Therefore a server taken out of rotation will be quickly identified when a socket connection fails. [1] https://cs.chromium.org/chromium/src/net/dns/host_resolver_impl.cc?q=kMinimumTTLSeconds&sq=package:chromium&l=84&dr=CSs https://cs.chromium.org/chromium/src/net/dns/host_resolver_i...