Adding custom parameter to sub link

[bjerfan]

Fragment lately have been real popular, on android and v2rayNG subscription link works fine and everything works well, but on iOS, subscription links either as normal or json dont work well, Applications like streisand or v2box have added custom query in link for different properties to be added on the config, for example, for fragment on streisand you have to add "vless://id@ip:port?security=tls&...&fragment=50-150,50-150,tlshello#Name" example for fragment query (fragment=length,interval,packet). But for example v2box has a different query it goes by "fragment=packets,lenght,interval" and there is more properties that can be changed only from link and custom queries. Having an option for custom queries and adding different parameters to subscription link is really helpful for the community. also after version 2.2.7 sub isnt working, subjson is working well but normal sub gives error 500