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.
POST /api/documents/search HTTP/1.1 
Host: doapigw.baasbv.nl 
Accept: text/csv
Content-Type: text/csv
Content-Length: length
{"SearchCriteria":"String","PageNumber":0,"PageSize":0,"ExcludeID":["00000000-0000-0000-0000-000000000000"],"AllVersions":false,"Archived":false}
 
HTTP/1.1 200 OK
Content-Type: text/csv
Content-Length: length
{"Results":[{"ID":"00000000-0000-0000-0000-000000000000","DisplayName":"String"}],"Total":0}