Hi psic4t,
thanks for quick fix yesterday: this source is fixed now.

Google calendar still don't work though.
('get shareable link', from web google calendar's settings)

It did not work before your fix but kept silent, now it prints

2022/06/14 14:30:48 Get 
"https://calendar.google.com/calendar/u/0?cid=XXXX": stream error: 
stream ID 1; INTERNAL_ERROR; received from peer

do you have any of those working maybe?
Have a nice day