Return json as default from Umbraco API Controller

Question

As the title says I would like to return json as default instead of XML. In a normal Web API i can edit App_Start/WebApiConfig.cs and add the following line but I can't find where to edit the configuration in Umbraco.

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));

I do not wan't my method to return JsonResult to achieve this.

Answer 1

I looked at a similar solution first @sebastiaan but decided to override "ApplicationStarting" instead.

public class CustomApplicationEventHandler : ApplicationEventHandler
{
    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        GlobalConfiguration.Configure(WebApiConfig.Register);
    }
}

And the WebApiConfig class:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
    }
}