設置cdn緩存的示例：
POST方式：
POST /2016-09-01/domain/SetCacheRuleConfig
Host: cdn.api.ksyun.com
X-Amz-Date: date
Authorization:authorization string
x-action: SetCacheRuleConfig
x-version: 2016-09-01
Content-Type: application/json
{
"DomainId":"2D09XC0",
"CacheRules":
[{
"CacheRuleType":"directory",
"Value":"/XXX/",
"CacheTime":11,
"RespectOrigin":"",
"CacheEnable":"on"
},
{
"CacheRuleType":"exact",
"Value":"/XXX/XXX.TXT",
"CacheEnable":"off"
}]
}
