Java Authenticator getRequestingHost() Method

The getRequestingHost() method of Authenticator Class is used to get the hostname of the site or proxy requesting authentication, or null if not available.

Syntax:

Parameter:

No parameter is passed.

Return:

The hostname of the connection requiring authentication, null if it's not available.

Throw:

Does not throw the exception.

Example 1

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.Authenticator; 
import java.net.InetAddress; 
import java.net.MalformedURLException; 
import java.net.PasswordAuthentication; 
import java.net.URL; 
  
public class AuthenticatorgetRequestingHostExample1  
{ 
    public static void main(String[] args)  
    { 
        try { 
            ClassAuthenticator obj1 =new ClassAuthenticator();
            Authenticator.setDefault(new ClassAuthenticator()); 
            URL url = new URL("https://www.javaTpoint.com"); 
            
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); 
            String line; 
            System.out.println("Host using url.getHost ::"+url.getHost()); 
           obj1.getPasswordAuthentication() ;
            while ((line = in.readLine()) != null) { 
                System.out.println(line); 
            } 
            in.close(); 
        } catch (MalformedURLException e) { 
            System.out.println("Malformed URL: " + e.getMessage()); 
        } catch (IOException e) { 
           System.out.println("I/O Error: " + e.getMessage()); 
        } 
    } 
  
    public static class ClassAuthenticator extends Authenticator  
    { 
        protected PasswordAuthentication getPasswordAuthentication()  
        { 
            this.show();
            String username = "admin"; 
            String password = "admin1"; 
            return new PasswordAuthentication(username, password.toCharArray()); 
        } 
        void show()
        {
            String hostname = getRequestingHost(); 
            System.out.println("hostname:" + hostname);  
        }
    } 
} 

Test it Now

Output:

Host using url.getHost ::www.javaTpoint.com
hostname:null
//The source code of https://www.javatpoint.com will be printed

Example 2

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.Authenticator; 
import java.net.InetAddress; 
import java.net.MalformedURLException; 
import java.net.PasswordAuthentication; 
import java.net.URL; 
  
public class AuthenticatorgetRequestingHostExample2   

{ 
    public static void main(String[] args)  
    { 
        try { 
             ClassAuthenticator obj1 =new ClassAuthenticator();
            Authenticator.setDefault(new ClassAuthenticator()); 
            obj1.getPasswordAuthentication() ;
            URL url = new URL("https://www.javaTpoint.com"); 

            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); 
  
            String line; 
            while ((line = in.readLine()) != null) { 
                System.out.println(line); 
            } 
            in.close(); 
  
        } catch (MalformedURLException e) { 
            System.out.println("Malformed URL: " + e.getMessage()); 
        } catch (IOException e) { 
            System.out.println("I/O Error: " + e.getMessage()); 
        } 
    } 
  
    public static class ClassAuthenticator extends Authenticator  
    { 
        protected PasswordAuthentication getPasswordAuthentication()  
        { 
            String hostname = getRequestingHost(); 
            System.out.println("Hostname:" + hostname); 
            String username = "admin"; 
            String password = "admin1"; 
            return new PasswordAuthentication(username, password.toCharArray()); 
        }
 

    } 
}

Test it Now

Output: