c# - ApiController not returning result to $http.post() request -

i have following controller in angularjs,

    var user = {         username: $scope.username,         password: $scope.password     };       var promisepost = loginservice.post(user);     promisepost.then(function (result) {         var res = result.data;         //todo: set permissions     }, 

this links service,

this.post = function (user) {     return $http.post(toapiurl('login'), user); } 

and in api controller have following,

    [system.web.http.httppost]     public ihttpactionresult post(userlogin user)     {         if (modelstate.isvalid)         {             // validate specified credentials             var validationresult = this.validateuser(user.username, user.password);             if (validationresult.isauthenticated)             {                 formsauthentication.setauthcookie(user.username, false);                 return ok();             }         }          return unauthorized();     } 

my issue never returns var res = result.data in javascript. if make api method empty (and change void) reach line in debugger, going wrong in api method. reaching actual return ok line, not going properly. ideas.?