Add arbitrary query parameters to the API. This is necessary to send name/value pairs to Taffrail, such as the Variable Marital_Status as married.

JSONAPI-style sparse fieldsets. Use ?[field]=prop1,prop2 to limit returned fields or ?[field]= to return no data for that property. Omitting the fields querystring parameter entirely defaults to all properties being returned.

Trims the variables[] array. Omit it and the default applies: Variables with a null value, System Variables, and Constant Variables are all dropped — equivalent to the example below. Send all for every Variable, untrimmed. Each keyword also works on its own, and a modifier implies the base filter it modifies, so variables:!system drops null-valued Variables as well as System Variables. A value that is not a string or an array of strings returns HTTP 400.

Include additional data, including debugging data. Do not use in Production.