“I mean, it’s been almost twenty years. Now, it’s possible you’re simply embedding Windows directory paths in your URIs, but in that case you need more than just a short lecture.”
YES YES YES. A MILLION TIMES YES.
People, I can’t stress this enough:
\ is a backslash
/ is a slash (or forward slash if you’re sassy)
ergo:
“http://” is pronounced aitch tee tee pee colon slash slash
But really, if you’re announcing a web address, you’re probably safe leaving that part off since most browsers will still resolve the URI.