http 状态码增加499

http_code.go

@@ -21,8 +21,12 @@ type HttpCode struct {
 func newHttpCodeData(httpCode int) HttpCode {
 	desc := http.StatusText(httpCode)
 	if len(desc) == 0 {
+		if httpCode == 499 {
+			desc = "client request timeout"
+		} else {
 			desc = fmt.Sprintf("%v: unknown error", httpCode)
 		}
+	}
 	return HttpCode{
 		Value: httpCode,
 		Code:  httpCode,
@@ -90,6 +94,7 @@ var (
 		newHttpCodeData(http.StatusTooManyRequests),
 		newHttpCodeData(http.StatusRequestHeaderFieldsTooLarge),
 		newHttpCodeData(http.StatusUnavailableForLegalReasons),
+		newHttpCodeData(499),
 
 		// 5xx
 		newHttpCodeData(http.StatusInternalServerError),