This is the default "404: Not Found" page. User agents that don't "Accept" HTML will see a JSON version instead. You can customize the control logic for your needs in config/404.js
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Sails considers a request to be in a "404: Not Found" state when a user requests a URL which doesn't match any of your app's routes or blueprints. You can also trigger this response from one of your controllers or policies with: return res.notFound();