文章从使用场景和底层实现两方面介绍了 socket 的概念，适合面试准备和技术学习。
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socket 的概念往往是面试中面试官喜欢问的问题，这篇文章中作者从socket的使用场景和socket的底层实现介绍了socket 到底是个啥
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