2019/9/5 第四部分：计算机基础 | FE-Interview UDP UDP UDP UDP UDP IP UDP UDP UDP UDP UDP TCP UDP TCP UDP TCP blog.poetries.top/FE-Interview-Questions/computed-base/#_3-5-树 1/37 2019/9/5 第四部分：计算机基础 | FE-Interview IPv4 UDP TCP UDP TCP Sequence number TCP Acknowledgement Number Window Size URG=1 ACK=1 TCP ACK PSH=1 RST=1 TCP TCP SYN=1 ACK=1 FIN=1 SYN=1 ACK=0 SYN=1 blog.poetries.top/FE-Interview-Questions/computed-base/#_3-5-树 2/37 2019/9/5 第四部分：计算机基础 | FE-Interview HTTP TCP TCP TCP TCP TCP TCP CLOSED LISTEN TCB TCB SYN-RECEIVED ESTABLISHED ESTABLISHED blog.poetries.top/FE-Interview-Questions/computed-base/#_3-5-树 3/37 2019/9/5 第四部分：计算机基础 | FE-Interview TCP TFO TFO cookie cookie RTT ESTABLISHED TCP FIN ACK blog.poetries.top/FE-Interview-Questions/computed-base/#_3-5-树 4/37 2019/9/5 第四部分：计算机基础 | FE-Interview HTTP Get Post Post Get Get URL Post Post URL request body Get Get Get RFC Post 200 OK blog.poetries.top/FE-Interview-Questions/computed-base/#_3-5-树 5/37