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Fix typo in what_happen_url.md #313

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Fix typo in what_happen_url.md #313

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2 changes: 1 addition & 1 deletion network/1_base/what_happen_url.md
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Expand Up @@ -136,7 +136,7 @@ HTTP 是基于 TCP 协议传输的，所以在这我们先了解下 TCP 协议

接下来有包的**序**号，这个是为了解决包乱序的问题。

还有应该有的是**确认号**，目的是确认发出去对方是否有收到。如果没有收到就应该重新发送，直到送达，这个是为了解决不丢包的问题。
接下来的是**确认号**，目的是确认发出去对方是否有收到。如果没有收到就应该重新发送，直到送达，这个是为了解决不丢包的问题。

接下来还有一些**状态位**。例如 `SYN` 是发起一个连接，`ACK` 是回复，`RST` 是重新连接，`FIN` 是结束连接等。TCP 是面向连接的，因而双方要维护连接的状态，这些带状态位的包的发送，会引起双方的状态变更。

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