$ ./1.ua.pl 
./1.ua.pl : turning hit counter on ...
./1.ua.pl : hit count is now: 0 hits over 0 s (to last hit) or over 1 s (to now/when stopped) (0.00 or 0.00 hits/hour)
ok 1 - time intervals (up-to-last-hit) must be zero on turn-on (0)
ok 2 - time intervals (up-to-stopped) records since turn-on irrespective of hits (1)
ok 3 - 0 hits at turn-on
./1.ua.pl : hitting site with GET 'http://www.python.org' ...
./1.ua.pl : success hitting http://www.python.org
./1.ua.pl : hit count is now: 2 hits over 2 s (to last hit) or over 3 s (to now/when stopped) (3600.00 or 2400.00 hits/hour)
ok 4 - time interval (up-to-stopped) must be positive (let's say 1-20 seconds).
ok 5 - time interval (up-to-last-hit) must be positive (let's say 1-20 seconds).
ok 6 - 2 hits because of a redirect
./1.ua.pl : turning hit counter off ...
./1.ua.pl : hit count is now: 2 hits over 2 s (to last hit) or over 3 s (to now/when stopped) (3600.00 or 2400.00 hits/hour)
./1.ua.pl : hitting site with GET 'http://www.python.org' ...
./1.ua.pl : success hitting http://www.python.org
./1.ua.pl : hit count is now: 2 hits over 2 s (to last hit) or over 3 s (to now/when stopped) (3600.00 or 2400.00 hits/hour)
ok 7 - no change in time interval because counter is off
ok 8 - no change in time interval because counter is off
ok 9 - no change in hits because counter is off
./1.ua.pl : turning hit counter back on again ...
./1.ua.pl : hit count is now: 0 hits over 0 s (to last hit) or over 0 s (to now/when stopped) (0.00 or 0.00 hits/hour)
ok 10 - hit count after starting
ok 11 - time interval to-now after starting must be positive integer (after slept for 1)
ok 12 - time interval since last hit must be zero, no hits yet
./1.ua.pl : hitting site with GET 'http://www.python.org' ...
./1.ua.pl : success hitting http://www.python.org
./1.ua.pl : hit count is now: 2 hits over 2 s (to last hit) or over 3 s (to now/when stopped) (3600.00 or 2400.00 hits/hour)
ok 13 - time interval must be positive (let's say 1-20 seconds).
ok 14 - time interval must be positive (let's say 1-20 seconds).
ok 15 - 2 hits because of a redirect
./1.ua.pl : hitting site with GET 'http://www.python.org' again ...
./1.ua.pl : success hitting http://www.python.org
./1.ua.pl : hit count is now: 4 hits over 8 s (to last hit) or over 9 s (to now/when stopped) (1800.00 or 1600.00 hits/hour)
ok 16 - time interval must be positive (let's say 1-20 seconds).
ok 17 - time interval must be positive (let's say 1-20 seconds).
ok 18 - 2 more hits because of a redirect
./1.ua.pl : resetting hit counter ...
./1.ua.pl : hit count is now: 0 hits over 0 s (to last hit) or over 0 s (to now/when stopped) (0.00 or 0.00 hits/hour)
ok 19 - time interval must be zero after reset
ok 20 - time interval must be zero after reset
ok 21 - number of hits must be zero after reset
./1.ua.pl : hitting site with a POST 'https://www.w3schools.com/action_page.php' ...
./1.ua.pl : success hitting https://www.w3schools.com/action_page.php
./1.ua.pl : hit count is now: 1 hits over 1 s (to last hit) or over 1 s (to now/when stopped) (3600.00 or 3600.00 hits/hour)
ok 22 - time interval must be positive (let's say 1-20 seconds).
ok 23 - time interval must be positive (let's say 1-20 seconds).
ok 24 - 1 hit this time...
1..24
./1.ua.pl : done.
$