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  1. You know about 404 error codes, but what the heck is a 503? - CNET

    • One of the most common errors you'll see, it means the page cannot be found. Nowadays, some sites will design its error code pages with cute puppies, links to other pages or a funny illustration to lighten your … See more

    400

    This one is best known as a "bad request" for the user. On Google Chrome, you'll get the message, "This page isn't working at the moment" along with some guidance about cont… See more

    CNET
    410

    This is the "Gone" status. You may see a message like, "This page does not exist" or "Page deleted or gone." There's no problem on your end -- you've got the right page, but the websit… See more

    CNET
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