import java.io.*;
import java.net.*;
URL url = new URL("https://api.whoisfreaks.com/v1.0/domain/availability?apiKey=API_KEY");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json");
conn.setDoOutput(true);
try(OutputStream os = conn.getOutputStream()) { os.write("{"domainNames":["jfreaks.pk","whoisfreaks.com"]}".getBytes()); }
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer content = new StringBuffer();
while ((inputLine = in.readLine()) != null) content.append(inputLine);
in.close();
System.out.println(content.toString());