Open External Link with Crosswalk Got Error net:ERR_INSECURE_RESPONSE

I want to make webview with crosswalk plugin. I put my webpage with https when the button click, I got an error.

Application Error
net::ERR_INSECURE_RESPONSE
(https://example.dummy.com)

This is my code :

home.html

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home.ts

import { Component } from ‘@angular/core’;
import { NavController } from ‘ionic-angular’;

@Component({
selector: ‘page-home’,
templateUrl: ‘home.html’
})

export class HomePage {

constructor(public navCtrl: NavController) {

}
goToPage(url : string) {
window.open(url, ‘_self’);
}

}

Please help me to fixed. Thanks