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當OOS系統服務繁忙，暫時不可使用時，OOS會向客戶端返回503響應碼和Retry-After響應頭。示例如下：

HTTP/1.1?503?Service?Unavailable
x-ctyun-request-id:?abdcf4945d14406a-30383a4b4e4948542d6b6e696854
Retry-After:?90
Date:?Tue,?6?May?2014?08:02:58?GMT
Content-Length:?133
Content-Type:?text/xml
Server:?CTYUN
?
<?xml?version='1.0'?encoding='UTF-8'?>
<Error>
????<Code>SlowDown</Code>
????<Message>Please?reduce?your?request?rate.</Message>
</Error>