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!! WARNING !!: Server hostname contains an underscore and this response sets a cookie. Internet Explorer does not permit cookies to be set on hostnames containing underscores. See http://support.microsoft.com/kb/316112
IE中cookie问题，带下划线的前置域名会不给设cookie，谷歌和火狐浏览器则不受影响
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原文地址：http://www.cnblogs.com/littlestart/p/5941686.html
