# CLB错误码有哪些？

CLB的错误码基本是遵循HTTP的规范。

## 客户端错误，返回4XX

* 400 Bad request：Your browser sent an invalid request.
* 403 Forbidden：Request forbidden by administrative rules.
* 408 Request Time-out：Your browser didn't send a complete request in time.

## 服务器错误，返回5XX

* 500 Server Error：An internal server error occured.
* 502 Bad Gateway：The server returned an invalid or incomplete response.
* 503 Service Unavailable：No server is available to handle this request.
* 504 Gateway Time-out：The server didn't respond in time.