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Angular JS $http post is not workng

I am trying post data to Rest web api using Angular JS $http.post.
I am getting the following error when debug the page. Any suggestions please.

XMLHttpRequest cannot load path/to/api. Response to preflight request doesn't pass access control check: No 'Access-
Control-Allow-Origin' header is present on the requestd resource.Origin 'http://localhost:12345' is therefore not allowed access.The respons had HTTP status code 500 please see the below Html and controller code.

<body ng-app="MyApp">
<table class="Tbl1" ng-controller="MyCtrl">
<tr width="100%">
<td align="right">
<label class="genLabel" for="usr">UserName:</label>
</td>
<td align="right">
<input type="text" class="genTextBox" id="usr" ng-model="userName">
</td>
</tr>
<tr>
<td align="right">
<label class="genLabel" for="comment">Comments:</label>
</td>
<td align="right">
<textarea rows="8" id="comment" class="genTextBox" ng-model="feedbackComments"></textarea>
</td>
</tr>
<tr>
<td align="right">
</td>
<td>
<button type="button" class="greenButton" ng-click="submitFeedback(UserName,feedbackComments)">Submit</button>

</td>
</tr>
<tr>
<td align="right">
</td>
<td>
<label class="genLabel" for="comment">{{statusMessage}}</label>

</td>
</tr>
</table>
</body>

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var MyApp = angular.module('MyApp',[]);
MyApp.Controller('MyCrtl,function($scope,$http)
{

$scope.submittedFeedBack =
{
   UserName: "",
   feedbackComments: ""
}
$scope.submifeedback = function(UserName,feedbackComments)
{
  $scope.submittedFeedBack.UserName = UserName;
  $scope.submittedFeedBack.feedbackComments = feedbackComments;
 var apiurl = 'path/to/api';
 var jsonSubmittedFeedback = angular.toJson($scope,submittedFeedBack);
 $http({
url: apiurl,
dataType: 'json',
method: 'POST',
data: jsonSubmittedFeedback,
headers: {
   "Content-Type": "application/json",
   "Authorization": "UserName xx"

}
}).success(function(response){
$scope.statusMessage = "Feedback successfully submitted";

}).error(function(error){
$scope.statusMessage = "Feedback not submitted";

});


}


});




});

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Thanks

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