devtools devtools=(chromedriver).driver

                                    package com.devtools;

import org.apache.commons.codec.binary.Base64;
import org.openqa.selenium.By;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.devtools.DevTools;
import org.openqa.selenium.devtools.network.Network;
import org.openqa.selenium.devtools.network.model.Headers;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

public class SetAuthHeader {

  private static final String USERNAME = "guest";
  private static final String PASSWORD = "guest";
  final static String PROJECT_PATH = System.getProperty("user.dir");

  public static void main(String[] args){
    System.setProperty("webdriver.chrome.driver", PROJECT_PATH + "/src/main/resources/chromedriver");
    ChromeDriver driver = new ChromeDriver();

    //Create DevTools session and enable Network
    DevTools chromeDevTools = driver.getDevTools();
    chromeDevTools.createSession();
    chromeDevTools.send(Network.enable(Optional.empty(), Optional.empty(), Optional.empty()));

    //Open website
    driver.get("https://jigsaw.w3.org/HTTP/");

    //Send authorization header
    Map<String, Object> headers = new HashMap<>();
    String basicAuth ="Basic " + new String(new Base64().encode(String.format("%s:%s", USERNAME, PASSWORD).getBytes()));
    headers.put("Authorization", basicAuth);
    chromeDevTools.send(Network.setExtraHTTPHeaders(new Headers(headers)));

    //Click authentication test - this normally invokes a browser popup if unauthenticated
    driver.findElement(By.linkText("Basic Authentication test")).click();

    String loginSuccessMsg = driver.findElement(By.tagName("html")).getText();
    if(loginSuccessMsg.contains("Your browser made it!")){
      System.out.println("Login successful");
    }else{
      System.out.println("Login failed");
    }

    driver.quit();
  }
}

                                    package com.devtools;

import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.devtools.DevTools;
import java.util.HashMap;
import java.util.Map;

public class SetDeviceMode {

    final static String PROJECT_PATH = System.getProperty("user.dir");

    public static void main(String[] args){
        System.setProperty("webdriver.chrome.driver", PROJECT_PATH + "/src/main/resources/chromedriver");
        ChromeDriver driver;
        driver = new ChromeDriver();

        DevTools devTools = driver.getDevTools();
        devTools.createSession();
        Map deviceMetrics = new HashMap()
        {{
            put("width", 600);
            put("height", 1000);
            put("mobile", true);
            put("deviceScaleFactor", 50);
        }};
        driver.executeCdpCommand("Emulation.setDeviceMetricsOverride", deviceMetrics);
        driver.get("https://www.google.com");
    }
}

                                    package com.devtools;

import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.devtools.DevTools;
import org.openqa.selenium.devtools.network.Network;
import org.openqa.selenium.devtools.network.model.ConnectionType;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

public class SetNetwork {

    final static String PROJECT_PATH = System.getProperty("user.dir");

    public static void main(String[] args){
        System.setProperty("webdriver.chrome.driver", PROJECT_PATH + "/src/main/resources/chromedriver");
        ChromeDriver driver;
        driver = new ChromeDriver();
        
        DevTools devTools = driver.getDevTools();
        devTools.createSession();
        devTools.send(Network.enable(Optional.empty(), Optional.empty(), Optional.empty()));
        devTools.send(Network.emulateNetworkConditions(
                false,
                20,
                20,
                50,
                Optional.of(ConnectionType.CELLULAR2G)
        ));
        driver.get("https://www.google.com");
    }
}