IdentityUser not serializing Web Api - serialization

Question

Not sure what is going on here.
I am exposing the Identity functionality through a Web API project. The CRUD aspect will be exposed to an admin app and the login, registration in a public facing app.
Right now I am just trying to return a list of all users in the database through a Web Api controller action. I am getting nothing output to the response, but I do get back data from the service:
/// <summary>
///
/// </summary>
/// <returns></returns>
[HttpGet]
[Route("")]
public async Task<IHttpActionResult> GetAllUsers()
{
var model = await _userService.GetAllUsers(); //<---Gets List<AppUser> here?
return Ok(model);
}
This action shows nothing on fiddler or Postman?
Any ideas?
public class AppUser : IdentityUser
{
public DateTime Created { get; set; }
}
Is there something special about the IdentityUser class that prevents it from being serialized?
Here is the web api serialization config:
config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
config.Formatters.Add(new JsonFormatter());
}
public class JsonFormatter : JsonMediaTypeFormatter
{
public JsonFormatter()
{
this.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
this.SerializerSettings.Formatting = Formatting.Indented;
}
public override void SetDefaultContentHeaders(Type type, HttpContentHeaders headers, MediaTypeHeaderValue mediaType)
{
base.SetDefaultContentHeaders(type, headers, mediaType);
headers.ContentType = new MediaTypeHeaderValue("application/json");
}
}

Answer 1

Found my answer. The IdentityUser class is not really meant to be exposed over an API; lots of sensitive data and all.
However this is will sit behind a firewall and I do not feel like writing a DTO and mapper just to make this work.
The answer is explained here
Basically you just need to override the properties you want exposed and decorate them with a DataMember attribute for serialization.