清理DNS缓存
Cloudflare
https://1.1.1.1/purge-cache
https://dns.google/cache
OpenDNS
https://cachecheck.opendns.com
Linux DNS缓存
sudo systemd-resolve --flush-caches
或
sudo /etc/init.d/nscd restart
Windows DNS缓存
ipconfig /flushdns
macOS DNS缓存
sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder
