Use 'client' that comes with the squid package.

-g count     Ping mode, "count" iterations (0 to loop until interrupted).

$ client -g 9 http://www.google.com/
2003-11-12 22:25:00 [1]: 7.759 secs, 0.075912 KB/s
2003-11-12 22:25:02 [2]: 2.219 secs, 0.265435 KB/s
2003-11-12 22:25:04 [3]: 2.409 secs, 0.244500 KB/s
2003-11-12 22:25:07 [4]: 2.551 secs, 0.230890 KB/s
2003-11-12 22:25:10 [5]: 3.149 secs, 0.187044 KB/s
2003-11-12 22:25:12 [6]: 1.980 secs, 0.297475 KB/s
2003-11-12 22:25:14 [7]: 1.880 secs, 0.313298 KB/s
2003-11-12 22:25:16 [8]: 2.680 secs, 0.219776 KB/s
2003-11-12 22:25:18 [9]: 1.361 secs, 0.432770 KB/s
9 requests, round-trip (secs) min/avg/max = 1.361/2.887/7.759