to monitor http traffic in real time you can use iftop
Code:
iftop -nP -f "port http"
-n means don't look up hostnames
-P means show the port used for connections
-f means use a filter
"port http" means filter on the port called http
It gives an average of 2 seconds, 10 seconds and 40 seconds for each connection plus a running total.
man iftop