title: OData update controller throwing 415 Unsupported media type error
body: <p>I have an OData controller with 'Put' and 'Post' actions. When I post <em>Content-Type:application/json</em>, I get an HttpResponseException with '415: unsupported media type'. The only <em>Content-Type</em> that the controller won't throw an exception on is the <em>application/x-www-urlformencoded</em>. But that is not the content type that I want to accept.</p>
  
  <p>Why does the odata controller not accept application/json? I don't see anything in the configuration of the controller that restricts the accepted content types. </p>
  
  <p>I remember the same code working in the past. Soemthing seems to have regressed it. Where should I look?</p>