WebApi2 Owin Claims Application Cookie - angularjs

Question

I have an SPA app built with AngularJS, the backend is WebApi2. I´m struggling with Authentication and Authorization. What I want in the long run is to enable authentication against Active Directory. But for now, I just trying to enable authorization for my APiControllers and setting a Cookie with Owin.
Here is my Owin Identity Helper class, I´m only adding 1 claim that is the serialized user info:
public void SignIn(bool rememberMe, T user)
{
var claims = new List<Claim>
{
new Claim(ClaimTypes.UserData, JsonConvert.SerializeObject(user)),
};
var claimsIdentity = new ClaimsIdentity(claims, DefaultAuthenticationTypes.ApplicationCookie);
AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = rememberMe }, claimsIdentity);
}
Here is authentication in controller:
[HttpGet, HttpPost]
[AllowAnonymous]
[Route("authenticate")]
public HttpResponseMessage Authenticate()
{
var authenticated = IdentityContext.Current.IsAuthenticated;
if (!authenticated)
{
var user = new User();
user.Email = "roger#moore.com";
user.Name = "Roger Moore";
user.Id = 23;
IdentityContext.Current.SignIn(true, user);
return new HttpResponseMessage()
{
Content = new StringContent(
JsonConvert.SerializeObject(user),
Encoding.UTF8,
"application/json"
)
};
}
else
{
//return the user if authenticated
return new HttpResponseMessage()
{
Content = new StringContent(
JsonConvert.SerializeObject(IdentityContext.Current.User), //from claim
Encoding.UTF8,
"application/json"
)
};
}
}
My StartUp class
public partial class Startup
{
// For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
public void ConfigureAuth(IAppBuilder app)
{
// Enable the application to use a cookie to store information for the signed in user
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/account/signedout")
});
}
}
When I call the authenticate user I´m setting signing in, but when calling a controller with [Authorize] attribute, im not signed in. Furthermore, when having fiddler running I get the error:
"[Fiddler] Response Header parsing failed. This can be caused by an illegal HTTP response earlier on this reused server socket-- for instance, a HTTP/304 response which illegally contains a body. Response Data:"
Does anyone have any suggestions, or alternatives with example code for using JWT Token Authentication and Authorization From Angular to WebApi2?