Commented Feature: When tracing is turned on, the formatters information returned in ApiExplorer is incorrect. [249]

Instead of the expected "System.Net.Http.Formatter.JsonMediaTypeFormatter", it returns a "System.Web.Http.Tracing.Tracers.JsonMediaTypeFormatterTracer".

The wrapper is expected to be ignored.
Comments: API explorer will return the correct formatter information after this fix: https://aspnetwebstack.codeplex.com/SourceControl/changeset/dc0f110a58d09674247b7ae7f1b242e94dd84cd4