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tcpdump captures HTTP Headers
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| sudo tcpdump -A -s 10240 'tcp port 4080 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | egrep --line-buffered "^........(GET |HTTP\/|POST |HEAD )|^[A-Za-z0-9-]+: " | sed -r 's/^........(GET |HTTP\/|POST |HEAD )/\n\1/g' | |
| # https://serverfault.com/questions/504431/human-readable-format-for-http-headers-with-tcpdump |
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