上周的时候Dmitry突然在5.4发布在即的时候, 引入了一个新的配置项:
Added max_input_vars directive to prevent attacks based on hash collisions
这个预防的攻击, 就是"通过调用Hash冲突实现各种语言的拒绝服务攻击漏洞"(multiple implementations denial-of-service via hash algorithm collision).
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