tcpdump only http
1. To monitor HTTP traffic including request and response headers and message body: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' 2. To monitor HTTP traffic including request and response headers and message body from a particular source: tcpdump -A -s 0 'src example.com and tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' 3. To monitor HTTP traffic including request and response headers and message body from local host to local host: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' -i lo 4. To only include HTTP requests, modify “tcp port 80” to “tcp dst port 80” in above commands 5. Capture TCP packets from local host to local host tcpdump -i lo