Catch outgoing HTTP requests from your server, where xx.xx.xx.xx your server IP address:
tcpdump -n -s 0 -A 'src xx.xx.xx.xx and tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)'
tcpdump show get post data
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Catch outgoing HTTP requests from your server, where xx.xx.xx.xx your server IP address:
tcpdump -n -s 0 -A 'src xx.xx.xx.xx and tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)'