dns 解析 ipv6 地址失败

domain_naming_service.cpp 里面如果是 ipv6 的地址，冒号后面不一定是端口，可能会解析失败？
报 “No port after colon in ...”

Start by reading the IPv6 parsing logic in domain_naming_service.cpp and reproduce the reported failure with an IPv6 address that has no port. Trace why the colon is treated as a port separator. Done means valid IPv6 addresses without ports no longer produce “No port after colon in ...”, while supported address-and-port forms continue to parse correctly.

Written by the indexing model from the issue text.