dyhkwong：vcn 不在 Hysteria 2 URI 规范中
作者原文@dyhkwongHysteria 2 URI scheme follows https://v2.hysteria.network/docs/developers/URI-Scheme/.
vcnis not in the specification, so non-standard parameters will of course not be added. Adding non-standard parameters support will only pollute the specification and cause interoperability issues.