How to call UserProfileService.asmx in a SharePoint Hosted App - cross-domain issue?

Hi,

I'm trying to call UserProfileService.asmx service from SharePoint Hosted App.

I've added myserver host name to the AppManifest remote endpoints.

<RemoteEndpoints><RemoteEndpoint Url="http://myserver/_vti_bin/UserProfileService.asmx" /></RemoteEndpoints>

I've tried in two ways

 jQuery.support.cors = true;
.ajax({
   crossDomain:true,
   url: "http://myserver/_vti_bin/UserProfileService.asmx/GetProfileSchemaNames",
   headers: { "accept": "application/json;odata=verbose" },
   success: function (data) {
     alert("ok");
   },
   error: function (data, errorCode, errorMessage) {
     alert("error");
   }
});

and I'm getting 'Access is denied' error.

I've tried also using SP.WebProxy:

var context = SP.ClientContext.get_current();
var request = new SP.WebRequestInfo();
request.set_url("http://myserver/_vti_bin/UserProfileService.asmx/GetProfileSchemaNames");
request.set_method("GET");
request.set_headers({ "Accept": "application/json;odata=verbose" });
var response = SP.WebProxy.invoke(context, request);
context.executeQueryAsync(
  function () => {
    alert("respose status code: " + response.get_statusCode().toString() + "; " + response.get_body());
  },
  function (error) => {
    alert(error);
  });

but I'm getting 401 error: “Remote server returned the following error while establishing a connection – ‘Unauthorized’”.

I've also do investigation with SP.RequestExecutor, but I think it is not useful for my problem, I'm not calling app from other server.

How can I overcome that issue?