whadaya知道，这是古老的停止浏览器缓存"的把戏！

Well whadaya know, it was the old "stop the browser caching" trick!

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<pre lang="xml"><meta http-equiv="Cache-Control" content="no-cache" /><br />
<meta http-equiv="PRAGMA" content="NO-CACHE" /><br />
<meta http-equiv="EXPIRES" content="-1" /></pre><br />