Access external web service using HTML Web Resource

Hi,

I am using HTML Web Resource.

I want to access external web services to access a method using HTML Web resource

how can I use external web service?

Here is my code:

function getEntityByID() {
var licencedata = {};
licencedata.key = "my-key";
licencedata.domains = "crm5.dynamics.com";
licencedata.sec = "CRM";
var jsonlicencedata = window.JSON.stringify(licencedata);

var oDataPath = "store.abc.com/.../licence.php";

$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
datatype: "json",
url: oDataPath,
data: jsonlicencedata,
beforeSend: function (XMLHttpRequest) {
XMLHttpRequest.setRequestHeader("Accept", "application/json");

/*tried by adding this headers -gives the same error
XMLHttpRequest.setRequestHeader("Content-Type", "application/json; charset=utf-8");
XMLHttpRequest.setRequestHeader("Access-Control-Allow-Origin", "*");
XMLHttpRequest.setRequestHeader("Access-Control-Allow-Credentials", "true");
XMLHttpRequest.setRequestHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
XMLHttpRequest.setRequestHeader("Access-Control-Allow-Headers", "Origin, Accept, Content-Type, X-Requested-With, X-CSRF-Token");*/

},

success: function (data, textStatus, XmlHttpRequest) {
alert("success");
},

error: function (XmlHttpRequest, textStatus, errorThrown) {

alert("fail" + errorThrown);

}
});
}

I am getting  error:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at store.abc.com/.../licence.php. (Reason: CORS header 'Access-Control-Allow-Origin' missing).