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抓取http get请求头：
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tcpdump -i eth0 -s 0 -A 'tcp dst port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420'
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抓取http post请求头请求体：
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tcpdump -i eth0 -s 0 -A 'tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)'
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抓取http请求头请求体和响应头响应体：
- tcpdump -i eth0 -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
