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能够在内部一些默认处理之前最优先做业务处理,例如需要对请求头或Host域做检查,如果不合法可忽略hv内部的RecvBody,Expect100,Proxy,ProtocolUpgrade等等一系列的内置处理,也可提前做个性化的rewrite头部信息从而影响hv后续的一些默认处理行为,顺便优化了 http 请求路径安全检查性能和流程。