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JSON problem in App Development with Swift's project "Restaurant"

In iBook App Development with Swift's guided Project Restaurant(chapter 5, page 837)>> Build and run your app with the server running. You should see a list of the categories that you defined back in menu.json.Problem :Nothing appears on the table view controllerEnter http://localhost:8090/categories into the browser, but the server returns nothing.server response: { "categories" : [ ] }
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String interpolation with a specifier or formatter?

Does anyone know where to find more detailed information about "String interpolation with a specifier/formatter"? I know we can use string interpolation to format a number: let pi = Double.pi "\(pi, specifier: "%.2f")" but I can't find any further information about this syntax, please help.
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Xcode Playground template on iPad Swift Playgournds?

Recently I noticed that there is a template for "Xcode Playgound" on the iPad Swift Playgrounds.Does anyone know the differences between the template for "Xcode Playground" and a normal empty template?Thanks.
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