我想使用httprouter与muxchain同时保留路由参数，例如/:user/。举个例子:funclog(reshttp.ResponseWriter,req*http.Request){fmt.Println("somelogger")}funcindex(reshttp.ResponseWriter,req*http.Request){fmt.Fprintf(res,"Hithere,Ilove%s!",req.URL.Path[1:])}funcmain(){logHandler:=http.HandlerFunc(log)indexHandler:=http.Handler