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		<title>Socket on 春江暮客</title>
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				<title>用 Python 探测 TCP 端口：区分连接拒绝、超时与系统错误</title>
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				<description>用 Python 标准库检查 IPv4 TCP 端口，输出 JSON 和退出码，并通过本地监听、拒绝连接与注入超时验证故障分类。</description>
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