how we can fetch url values in apex class 3f

1public with sharing class pageurlclass{
2 
3         /**
4         * Webkul Software.
5         *
6         * @category  Webkul
7         * @author    Webkul
8         * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
9         * @license   https://store.webkul.com/license.html
10         */
11 
12    public  String  headerdata{get;set;}
13    public string urlvalue{get;set;}
14    public string url{get;set;}
15        
16    public pageurlclass(){
17        
18         headerdata= ApexPages.currentPage().getHeaders().get('Host');
19        
20         urlvalue=Apexpages.currentPage().getUrl();
21        
22         url='https://' + headerdata+ urlvalue;
23    }
24  
25 
26}
27

1<apex:page controller="pageurlclass">
2 
3   <!-- 
4        /**
5         * Webkul Software.
6         *
7         * @category  Webkul
8         * @author    Webkul
9         * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
10         * @license   https://store.webkul.com/license.html
11         */
12         -->
13      
14  1.  {!headerdata}
15 
16  2.  {!urlvalue}
17 
18  3.  {!url}
19 
20</apex:page>
21