I changed http to https:
String feed = "https://makezine.com/feed/";
It now works with original code for this example and correction for The type Serial is ambiguous:
There are 5 occurrences of love (find on page) at that link so the 20 is correct!
I was using a VPN before and that generated other connection errors.
I commented this out for testing because I did not have Arduino code and it was blocking:
//port.write(cs); // send data to Arduino
There is a link for “original code for this example” here:
Type Serial is ambiguous - #4 by glv
Seek and you shall find.
The above is on my W10 PC with Processing 4.5.2 and VPN not used.
:)