WebApi Global.asax

Global.asax

public class MvcApplication : HttpApplication
{
    protected void Application_Start()
    {
        ...
        GlobalConfiguration.Configuration.MessageHandlers.Add(new OptionsHandler());
        GlobalConfiguration.Configuration.MessageHandlers.Add(new MethodOverrideHandler());
        GlobalConfiguration.Configuration.Formatters.Insert(0, new TypedXmlMediaTypeFormatter ...);
        GlobalConfiguration.Configuration.Formatters.Insert(0, new TypedJsonMediaTypeFormatter ...);
        ...
    }
}