For some reason, Internet Explorer and Chrome were unable to connect to any web sites, while Firefox was able to. It seems that there was a failure in WinHttp as well. I was able to ping www.google.com and www.microsoft.com.
Initial reboot of the computer didn't work as well. I then ran Fiddler, and when I used IE to browse www.google.com, nothing showed up on Fiddler, even though I've updated the proxy to point to Fiddler's 127.0.0.1:8888.
Then, I enabled both 32-bit and 64-bit WinHTTP logging like so:
and finally disabled it as follows:
After sufficient tracing, I found out that the winsock layer needed a reset:
followed by a reboot of the computer, and then everything started working.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes