How does a website (or podcast) send out notification of updates?
I have subscribed to a sample podcast and see that I do get alerts (upper right corner of screen) on my MacBook. I have not yet verified those alerts only show up when I have Chrome opened, but that because I always have Chrome open.
Here is what I see under Settings as the Allowed sites.
![Screen-Shot-2018-11-26-at-11.48.02-A.png]()
What is port 443?
Does this mean my port 443 is open to alerts from these two websites?
Please let me know how this works, since I am considering using this for my podcast. Or, if you give me the name of this type of communications, I can look for solutions which I can adopt to have this behavior.
Thanks.
https://en.wikipedia.org/wiki/RSS
See also chapter 6 in there: https://en.wikipedia.org/wiki/RSS#Podcasting_and_RSS
The client regularly check this "RSS"-feed which hold a list of "new" items.
if the RSS Summary changes the actual content is fetched.
Port 443 is a HTTPS protocol port. (normal web access).