To override the Content-type in your clients, use the HTTP Accept Header, append  the .csv suffix or  ?format=csv
        
        HTTP + CSV
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
PUT /bookings/{Id}/refund/{PaymentLogId} HTTP/1.1 
Host: testapi.bokamera.se 
Accept: text/csv
Content-Type: text/csv
Content-Length: length
{"CompanyId":"00000000-0000-0000-0000-000000000000","Id":0,"PaymentLogId":0,"Amount":0,"Comments":"String"}
 
HTTP/1.1 200 OK
Content-Type: text/csv
Content-Length: length
{}