How do I get response header from HTTP request?

package org.kodejava.example.network;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpResponseHeaderDemo {
    public static void main(String[] args) {
        try {
            URL url = new URL("https://kodejava.org/index.php");
            URLConnection connection = url.openConnection();

            Map<String, List<String>> responseMap = connection.getHeaderFields();
            for (String key : responseMap.keySet()) {
                System.out.print(key + " = ");

                List<String> values = responseMap.get(key);
                for (String value : values) {
                    System.out.print(value + ", ");
                }
                System.out.println();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

The result produced by the code above are:

Transfer-Encoding = chunked, 
Keep-Alive = timeout=5, max=100, 
null = HTTP/1.1 200 OK, 
Server = Apache, 
Connection = Keep-Alive, 
Link = ; rel="https://api.w.org/", ; rel=shortlink, 
Date = Mon, 07 May 2018 07:48:34 GMT, 
Content-Type = text/html; charset=UTF-8, 

Wayan Saryada

Founder at Kode Java Org
I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. You can support my works by donating here. Thank you 🙂.

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