例如在PUT的时候，加入If-Modified-Since参数，返回501 Not Implemented错误
请求示例：
PUT /bucket/my-image.jpg HTTP/1.1Host: storage.aliyun.comDate: Wed, 28 May 2011 22:32:00 GMTIf-Modified-Since: Wed, 06 Apr 2011 10:02:46 GMT
返回消息头示例:
501 Not Implementedx-oss-request-id: 77E534EBF90372BEContent-Type: application/xmlTransfer-Encoding: chunkedDate: Thu, 28 Apr 2011 08:03:07 GMTConnection: closeServer: AliyunOSS
返回消息体示例:
<?xml version="1.0" ?><Error> <Code> NotImplemented </Code> <Message> A header you provided implies functionality that is not implemented. </Message> <Header> If-Modified-Since </Header> <RequestId> 77E534EBF90372BE </RequestId> <HostId> storage.aliyun.com </HostId></Error>新闻热点
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