==== Analyze HTTP traffic with simple command line tools ====

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This "simple" and yet effective command will show all the incoming/outgoing HTTP GET and POST plain requests.
<code bash>
stdbuf -oL -eL tcpdump -A -s 10240 "tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)" | \
    egrep -a --line-buffered ".+(GET |HTTP\/|POST )|^[A-Za-z0-9-]+: " | \
    perl -nle 'BEGIN{$|=1} { s/.*?(GET |HTTP\/[0-9.]* |POST |HEAD )/\n$1/g; print }'\n
</code>