You’ll have to change the return type of the method to HttpResponseMessage
, then use Request.CreateResponse
:
// GET api/Audit/CSV
[HttpGet, ActionName("CSV")]
public HttpResponseMessage Csv(Guid sessionId, DateTime a, DateTime b, string predicate)
{
var result = new StringBuilder();
//build a string
var res = Request.CreateResponse(HttpStatusCode.OK);
res.Content = new StringContent(result.ToString(), Encoding.UTF8, "text/csv");
return res;
}