There was a time when accessing a website required a user to manually type in “http://” and it was pretty annoying. Most browsers fill in that prefix automatically now, but the seven-character preamble – letters and slashes and all – is still baked into the operations of the World Wide Web.
Years later, the man typically credited with creating the World Wide Web, Tim Berners-Lee, admitted in a 2009 interview that it was not essential to add the two slashes to the sequence. Mr. Berners-Lee and his team could have decided on just "http:" and the Web would worked all the same.
Mr. Berners-Lee felt bad for the wasted resources and manual labor he created. He says this unnecessarily inclusion was his one regret looking back on his career. However, compared to some of the other ways we waste our time on the Internet today, this one blunder seems rather small in the grand scheme of things.