you could save yourself 3 keystrokes by typing in "https://http.cat"

You can save yourself another 2 keystrokes by adding Wikipedia as a search engine to your browser, giving it the shortcut "w" and typing "w http status codes" Works on Firefox and Chrome, hit sure about other browsers

Wow... TIL that the placement of the bang in the search string (and even the position of the exclamation mark) doesn't matter!