To override the Content-type in your clients HTTP Accept Header, append  the .json suffix or  ?format=json
To embed the response in a jsonp callback, append ?callback=myCallback
        
        HTTP + JSON
         The following are sample HTTP requests and responses. 
            The placeholders shown need to be replaced with actual values.
POST /json/reply/ExportValidationRequest HTTP/1.1 
Host: scanning.modernekonomi.se 
Content-Type: application/json
Content-Length: length
{"InvoiceIds":null,"SupplierIds":null}
 
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: length
{"ClientVersion":0,"InvoiceVersions":null,"SupplierVersions":null}