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Java 11 Tutorial

Java 11 Other Resources

Standard Http Client

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An improved HttpClient API was launched in Java 9 as an experimental attribute. With Java 11, now HttpClient may be a standard. it's recommended to use rather than other HTTP Client APIs such as Apache HTTP Client API. It's quite attributed rich and also from now, onwards Java-based applications can easily make HTTP requests without making use of any external dependency.

Steps

Steps to use an HttpClient are given below:

  • Make HttpClient instance using HttpClient.newBuilder() instance
  • Make HttpRequest instance by making use of HttpRequest.newBuilder() instance
  • Make an invitation by making use of httpClient.send() and obtain a reply object

Example

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

public class APITester {
   public static void main(String[] args) {
      HttpClient httpClient = HttpClient.newBuilder()
         .version(HttpClient.Version.HTTP_2)
         .connectTimeout(Duration.ofSeconds(10))
         .build(); 
         try {

            HttpRequest request = HttpRequest.newBuilder()
            .GET()
            .uri(URI.create("https://www.google.com"))
            .build();                              
            HttpResponse<String> response = httpClient.send(request,
            HttpResponse.BodyHandlers.ofString()); 

         System.out.println("Status code: " + response.statusCode());                            
         System.out.println("Headers: " + response.headers().allValues("content-type"));
         System.out.println("Body: " + response.body());
      } catch (IOException ' InterruptedException e) {
         e.printStackTrace();
      }
   }
}

Output

Your response must look like this:

Status code: 200
Headers: [text/html; charset=ISO-8859-1]
Body: <!doctype html>
...
</html>