How to change default ASP.NET MVC Web API media formatter?

Question

I have a Web API project that returns some product data. It negotiates the return type correctly depending on the Accept header (JSON/XML) of the request. The problem is, if

Answer 1

Found a solution via http://www.strathweb.com/2013/06/supporting-only-json-in-asp-net-web-api-the-right-way/

Added this in WebApiConfig.Register():

config.Formatters.Clear();
config.Formatters.Add(new XmlMediaTypeFormatter());
config.Formatters.Add(new JsonMediaTypeFormatter());
config.Formatters.Add(new FormUrlEncodedMediaTypeFormatter());

So default is XML, the first formatter, but the API still supports JSON if the request asks for it.