View my 404 page on my localhost, Rails

So I've been working on my 404 page, because 404s are frustrating enough without poor formatting and bland design, but whenever I make a change, I don't know how to view it on my localhost. If I go to a page that doesn't exits, (`localhost:3000/foobar`), it simply says there is no route for it. Same thing happens if I go directly to `localhost:3000/public/404.html`. Every time I want to view it, I have to push it to heroku, which is frustrating and breaks my standard for coding. Is there any way to render my 404 page on my localhost?