恢复处理程序，以防止服务器崩溃

Created: November-22, 2018

func Recovery(h http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request){
        defer func() {
            if err := recover(); err != nil {
                // respondInternalServerError
            }
        }()
        h.ServeHTTP(w , r)
    })
}