No 'Access-Control-Allow-Origin' header is present...

When attempting to execute the following javascript:

var url = 'http://www.mywebsite.com/wp-content/private/data.json';
    
try {
      $.getJSON(url, function(result){
          console.log(result);
      });
} catch(e) {
      console.log(e);
}

Select allOpen in new window

I get this error: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' is therefore not allowed access.

Here are the headers I am setting:

angular.module.config(['$httpProvider', function($httpProvider) {
        $httpProvider.defaults.headers.common = {'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Method': 'GET, POST'};
        $httpProvider.defaults.headers.post = {};
        $httpProvider.defaults.headers.put = {};
        $httpProvider.defaults.headers.patch = {};
        $httpProvider.defaults.useXDomain = true;
        $httpProvider.defaults.withCredentials = true;
        delete $httpProvider.defaults.headers.common['X-Requested-With'];
        $httpProvider.defaults.headers.common["Accept"] = "application/json";
        $httpProvider.defaults.headers.common["Content-Type"] = "application/json";
        }
    ]
)

Select allOpen in new window

What am I doing wrong?  Do I need to set something on the website?  If so what?
Thank you very much