[ruby/webrick] Support literal IPv6 addresses in X-Forwarded-Host
https://github.com/ruby/webrick/commit/6b6990ec81
[ruby/webrick] Support literal IPv6 addresses in X-Forwarded-Host
https://github.com/ruby/webrick/commit/6b6990ec81