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    <title>API 幂等性设计实战：四种方案对比与代码实现</title>
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    <description><![CDATA[为什么幂等性值得你认真对待 你写了一个支付接口，用户点击「确认支付」后网络抖动了一下，前端自动重试。结果用户被扣了两次钱。这个场景在分布式系统]]></description>
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