String userpassword = "login" + ":" + "password";
        conn.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString(userpassword.getBytes()));

 https://qwerty.uz/users/client.htm?id=1 

 https://qwerty.uz/login.htm 

 https://qwerty.uz/users/client.htm?id=1 

import javax.net.ssl.HttpsURLConnection;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;
import java.util.List;

public class Qwerty  {


    private List<String> cookies;
    private HttpURLConnection conn;

    private final String USER_AGENT = "Mozilla/5.0";

    public static void main(String[] args) throws Exception {

        String url = "https://qwerty.uz";
        String query = "https://qwerty.uz/users/client.htm?id=1";

        Qwerty http = new Qwerty();

        // make sure cookies is turn on
        CookieHandler.setDefault(new CookieManager());

        // 1. Send a "GET" request, so that you can extract the form's data.
        String page = http.GetPageContent(url);

        // 2. Construct above post's content and then send a POST request for
        // authentication
        String p = "login:password";
        http.sendPost(url, p);

        // 3. success then go to query.
        String result = http.GetPageContent(query);
        System.out.println(result);
    }

    private void sendPost(String url, String postParams) throws Exception {
        System.out.println("+++++++++++++++++sendPOST");
        URL obj = new URL(url);
        conn = (HttpsURLConnection) obj.openConnection();

        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Host", "uty.smpo.uzgps.uz");
        conn.setRequestProperty("User-Agent", USER_AGENT);
        conn.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
        conn.setRequestProperty("Connection", "keep-alive");
        conn.setRequestProperty("Referer", "https://qwerty.uz");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        conn.setDoOutput(true);
        conn.setDoInput(true);

        conn.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString(postParams.getBytes()));

        int responseCode = conn.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + postParams);
        System.out.println("Response Code : " + responseCode);

        try (BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {
            String inputLine;
            StringBuilder response = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            // System.out.println(response.toString());
        }

        System.out.println("-----------------sendPOST");
    }

    private String GetPageContent(String url) throws Exception {
        System.out.println("++++++++++++++GetPageContent");
        URL obj = new URL(url);
        conn = (HttpsURLConnection) obj.openConnection();

        // default is GET
        conn.setRequestMethod("POST");

        conn.setUseCaches(false);

        // act like a browser
        conn.setRequestProperty("User-Agent", USER_AGENT);
        conn.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml, application/json;charset=UTF-8;q=0.9,*/*;q=0.8");
        conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
        if (cookies != null) {
            for (String cookie : this.cookies) {
                conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
            }
        }
        int responseCode = conn.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);

        StringBuffer response;
        try (BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {
            String inputLine;
            response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine+"\n");
            }
        }

        // Get the response cookies
        setCookies(conn.getHeaderFields().get("Set-Cookie"));

        System.out.println("------------------GetPageContent");
        return response.toString();

    }

    public void setCookies(List<String> cookies) {
        this.cookies = cookies;
    }

}