To override the Content-type in your clients, use the HTTP Accept Header, append  the .xml suffix or  ?format=xml
        
        HTTP + XML
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
POST /newsletter/templates/test HTTP/1.1 
Host: testapi.bokamera.se 
Accept: application/xml
Content-Type: application/xml
Content-Length: length
<TestSendNewsLetter xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/BokaMera.API.ServiceModel.Dtos">
  <CompanyId>00000000-0000-0000-0000-000000000000</CompanyId>
  <Id>0</Id>
  <Receiver>String</Receiver>
</TestSendNewsLetter>
 
HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: length
<NewsletterLogQueryResponse xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/BokaMera.API.ServiceModel.Dtos">
  <Created>0001-01-01T00:00:00</Created>
  <Id>0</Id>
  <MessageBody>String</MessageBody>
  <MessageRetries>0</MessageRetries>
  <MessageTitle>String</MessageTitle>
  <Receiver>String</Receiver>
  <SendMethodId>0</SendMethodId>
  <Sent>false</Sent>
  <SentDate>0001-01-01T00:00:00</SentDate>
  <ToSendDate>0001-01-01T00:00:00</ToSendDate>
</NewsletterLogQueryResponse>