Configuring CORS in an Angular JS controller

Having a controller with a service that retrieves JSON from another server, I encountered the following issue:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http:somesite.com. This can be fixed by moving the resource to the same domain or enabling CORS.

I've seen similar issues resolved by adding

"Access-Control-Allow-Origin": "*"
to the header, but so far, I haven't made any progress in resolving it myself.

Here is the code for my controller:

var myApp = angular.module('cplanner',[]);

myApp.controller('GetItemCtrl', ['$scope', '$http', function($scope, $http) {

    var itemUrl = 'http:somesite.com';

    $http({url: itemUrl,
    dataType: 'json',
    method: 'POST',
    dataType : 'json',
    headers: {
       "Access-Control-Allow-Origin": "*",
       "Access-Control-Allow-Methods": "POST, GET, OPTIONS, PATCH, DELETE",
       "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"
    },
    xhrFields: {
        withCredentials: true
    }}).success(function(data, status, headers, config) {
        if(data.status == "ok"){
        console.log(data.data);
            $scope.items = data.data;
        }


        }).error(function(data, status, headers, config) {


    });

}]);

Despite adding the necessary headers, the cross-origin issue persists. Any guidance or suggestions on how to successfully retrieve responses from an external server would be greatly appreciated. Thank you.

Answer №1

Cross-origin resource sharing (CORS) is an important server-side solution. When a web client, such as JavaScript, makes a request to a different domain, the first request sent is an OPTIONS request. The origin server then responds with information on whether it allows cross-domain requests by providing headers like:

   "Access-Control-Allow-Origin": "*",
   "Access-Control-Allow-Methods": "POST, GET, OPTIONS, PATCH, DELETE",
   "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"

After this initial exchange, the browser proceeds to send the actual intended request automatically. Enabling CORS on your server facilitates this process seamlessly. For guidance on enabling CORS, check out the following helpful resources:
ASP.NET WEBAPI
APACHE

Answer №2

In order to make CORS work, server-side configuration is crucial. Without access to the server, it will be difficult to achieve your desired outcome. However, if you do have access, make sure to educate yourself on how to enable CORS for the specific programming language used in the API :)

For more information, check out this link: Understanding CORS with AngularJS

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