Imagine for a moment that you’re searching for a topic.
You find what you’re looking for on the first page of Google’s search results and click through to the website. But instead of the expected web page, you find yourself staring down the barrel of a 503: Service Unavailable error message.
You’re going to immediately click back and navigate to the next result, right?
More often than not, a visitor confronted with a 503 status code will immediately return to the search results and go somewhere else.