I had a teacher in high school who once wrote a URL on the whiteboard like this: com/foo/bar.html Upon informing him that he had forgotten to write the domain,

I had a teacher in high school who once wrote a URL on the whiteboard like this: com/foo/bar.html Upon informing him that he had forgotten to write the domain, I learned that the site was actually www.com, and he had just left the http://www http://www part off because “the web browser adds that automatically”. I assured him that, while in principle he was more or less correct, but in this case it wouldn’t work. He ended up adding the www, but I could tell he was skeptical that I was just being a smart ass.