I don't know which documentation you looked. In the file HCExtensions.html a usage example.
en=hc.ssl_handling_enabled('https://mail.ru', 'Boss')
hc.ssl_handling_enabled is not a variable. hc.ssl_handling_enabled is a function. Therefore, it is necessary to use
if hc.ssl_handling_enabled() == true then
The word true should be without quotes. With quotes you get the string. And the function returns a Boolean value.