ContentType in TRESTClient

[Union]

So geht es also definitiv nicht?

Delphi-Quellcode:

 RestClient.ContentType := 'application/veryspecialjson+V42';
 RestRequest.Params.AddItem('Content-Type',
    RestClient.ContentType,
    TRESTRequestParameterKind.pkHTTPHEADER,
    [TRESTRequestParameterOption.poDoNotEncode],
    TRESTContentType.ctNone);