Java Authenticator getRequestingProtocol() Method

Last Updated : 17 Mar 2025

The getRequestingProtocol() method of Authenticator class give the protocol that is requesting the connection. This will be based on a URL.

Syntax:

Parameter:

No parameter is passed.

Return:

The protocol used.

Throw:

Does not throw any 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 AuthenticatorgetRequestingProtocolExample1   
{ 
    public static void main(String[] args)  
    { 
        try { 
            ClassAuthenticator obj1 =new ClassAuthenticator();
            Authenticator.setDefault(new ClassAuthenticator()); 
            URL url = new URL("https://www.tpointtech.com"); 
            System.out.println("Protocol Used:  " +url.getProtocol());
            
            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 = "TpointTech"; 
            String password = "java"; 
            return new PasswordAuthentication(username, password.toCharArray()); 
        } 
        void show()
        {
            String hostname = getRequestingProtocol(); 
            System.out.println("Protocol:" + hostname);  
        }
     } 
} 

Output:

Protocol Used:  https
Host using url.getHost ::www.TpointTech.com
Protocol:null
//source code of https://www.tpointtech.com is 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 AuthenticatorgetRequestingProtocolExample2   
{ 
    public static void main(String[] args)  
    { 
        try { 
             ClassAuthenticator obj1 =new ClassAuthenticator();
            Authenticator.setDefault(new ClassAuthenticator()); 
            obj1.getPasswordAuthentication() ;
            URL url = new URL("https://www.tpointtech.com"); 
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); 
            System.out.println("Protocol Used:  " +url.getProtocol());
            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 name = getRequestingProtocol(); 
            System.out.println("  " +name ); 
            String username = "TpointTech"; 
            String password = "tutorial"; 
            return new PasswordAuthentication(username, password.toCharArray()); 
        } 
    } 
}

Output:

null
Protocol Used:  https
// Source code of https://www.tpointtech.com is printed.

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Java Authenticator getRequestingProtocol() Method

Syntax:

Parameter:

Return:

Throw:

Example 1

Example 2

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