Parameters default value is not working

[code-vj]

I am trying to set default fields by setting default value of fields parameter, see below code, this code not working and ignoring it and returning all fields.

`[Route("")]
[HttpGet]
public HttpResponseMessage GetAllLoginThemes(string Key, string Secret, string fields = "Data(Name,Title,IsPaid)")
{

    }`

[dotarj]

PartialResponse operates on the values in the query string (HttpRequestMessage.RequestUri.Query), so adding a parameter 'fields' with default values will not work.