An annoying issue pertaining to broken Twitter links, which has persisted in Safari for Mac since November 2015, has been fixed in the third beta of the forthcoming OS X 10.11.4 El Capitan software update, according to user reports on the Apple Support Communities forums.
The “Safari can’t open the page because the server where this page is located is not responding” error page no longer appears when clicking shortened “t.co” Twitter links with the secure HTTPS protocol in Safari and third-party apps like Tweetbot.