我正在尋找一種方法來實(shí)現(xiàn)權(quán)限檢查功能，使用http這個(gè)想法是有些API應(yīng)該只由登錄會(huì)話使用。func CheckPermissionFilter(w http.ResponseWriter, r *http.Response){    sid, err := r.Cookie("sid")    // check the permission with sid, if permission is granted then just let the     // process go on, otherwise, just break the filter chain and return Http Error Code.}func SomeHttpHandler(w http.ResponseWriter, r *http.Response){     CheckPermissionFilter(w, r)     // if not breaked by above filter function, process the request...   }我對(duì)權(quán)限檢查沒有問題，但我找不到破壞HTTP請(qǐng)求處理的方法。