System.NotSupportedException: Unknown language 'mjs', Supported languages: csharp, typescript, dart, java, kotlin, python, swift, vbnet, fsharp at ServiceStack.NativeTypes.LangGeneratorExtensions.GenerateSourceCode(MetadataTypes metadataTypes, MetadataTypesConfig typesConfig, String lang, IRequest req, Action`1 configure) at ServiceStack.NativeTypes.LangGeneratorExtensions.GenerateSourceCode(List`1 metadataTypes, String lang, IRequest req, Action`1 configure) at ServiceStack.Metadata.BaseMetadataHandler.d__12.MoveNext() 
To override the Content-type in your clients, use the HTTP Accept Header, append the .xml suffix or ?format=xml
The following are sample HTTP requests and responses. The placeholders shown need to be replaced with actual values.
POST /xml/reply/GetCoordinators HTTP/1.1 
Host: doapigw.baasbv.nl 
Accept: application/xml
Content-Type: application/xml
Content-Length: length
<GetCoordinators xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/IDB.API.DTO.Workflow.Operations">
  <PageNumber>0</PageNumber>
  <PageSize>0</PageSize>
  <SearchCriteria>String</SearchCriteria>
  <SelectedUserID>0</SelectedUserID>
</GetCoordinators>
HTTP/1.1 200 OK
Content-Type: application/xml
Content-Length: length
<ArrayOfUser xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/IDB.API.DTO">
  <User>
    <ID>0</ID>
    <Image>Icons/User</Image>
    <IsChecked>false</IsChecked>
    <Title>String</Title>
  </User>
</ArrayOfUser>