支持 http 处理链返回 HTTP_STATUS_WANT_CLOSE #716
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能够在各个处理链线程安全的通过返回此值要求无视Http头keep-alive强制关闭连接,甚至可选搭配处理链的回调中将ctx->writer->state = hv::HttpResponseWriter::SEND_END; 实现取消hv内部默认响应http状态包变为自定义响应非http报文或不响应任何数据,让非法访问无法探测外网端口的具体服务性质。