1SELECT @@proxy_protocol_networks; 2@@proxy_protocol_networks 3127.0.0.1,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,127.0.0.1/32,0:0:0:0:0:0:0:1,FF:FF::0/96,FF::1/128 4SET @@GLOBAL.proxy_protocol_networks='*'; 5ERROR HY000: Variable 'proxy_protocol_networks' is a read only variable 6SET @@SESSION.proxy_protocol_networks='foo'; 7ERROR HY000: Variable 'proxy_protocol_networks' is a read only variable 8# restart:--proxy-protocol-networks= 9