REST Web Service URLs with Parameters
If the URL for the web service contains all the parameters and information that the web service needs, MashZone NextGen validates any parameters and values you supply in this URL. They are also used to generate metadata for the mashable. When users or apps run the mashable, MashZone NextGen sends a request to the web service using the HTTP GET operation.
Tip: It is a good practice to list all possible parameters even though individual requests can omit parameters that are not needed for that request.
See also
GET-Based REST Web Services for more information on parameters and default values.