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provides()

Defines formats that the controller will respond with upon request. The format can be requested through a URL variable called format, by appending the format name to the end of a URL as an extension (when URL rewriting is enabled), or in the request header.

Name	Type	Required	Default	Description
formats	string	No		Formats to instruct the controller to provide. Valid values are `html` (the default), `xml`, `json`, `csv`, `pdf`, and `xls`.

provides("html,xml,json");