Model always null on XML POST

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Two things:

  1. You don’t need quotes "" around the content type and accept header values in Fiddler:

    User-Agent: Fiddler
Content-Type: application/xml
Accept: application/xml

  2. Web API uses the DataContractSerializer by default for xml serialization. So you need to include your type’s namespace in your xml:

    <TestModel 
xmlns="http://schemas.datacontract.org/2004/07/YourMvcApp.YourNameSpace"> 
    <Output>Sito</Output>
</TestModel>

    Or you can configure Web API to use XmlSerializer in your WebApiConfig.Register:

    config.Formatters.XmlFormatter.UseXmlSerializer = true;

    Then you don’t need the namespace in your XML data:

     <TestModel><Output>Sito</Output></TestModel>

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