404 Errors and 404 Pages

If a site has undiscovered missing images, JavaScript, or CSS files, it causes a 404 error for the page. You can use any link crawler to find broken links or missing images during non-peak times. You can also use Firebug to identify 404 error messages on a page.

These error messages aren't visible if they are due to a missing JavaScript or a missing include, but to improve performance, resolve the errors. The messages affect performance because the missing item can't be cached and therefore the page tries to retrieve it each time the request is made.

404 pages also affect the selling potential of a site. If a customer searches for an item that doesn't exist, they might receive a 404 error page. Customize 404 pages to draw customers back to the shopping experience. Salesforce recommends adding the following to 404 pages:

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