code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  package org.openqa.selenium.devtools;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import java.util.Map;
  import java.util.stream.Collectors;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.By;
  import org.openqa.selenium.JavascriptExecutor;
  import org.openqa.selenium.devtools.idealized.Network;
  import org.openqa.selenium.testing.NotYetImplemented;
  import org.openqa.selenium.testing.drivers.Browser;
  
  class ChangeUserAgentTest extends DevToolsTestBase {
  
    @Test
    @NotYetImplemented(value = Browser.FIREFOX, reason = "Network interception not yet supported")
    public void canChangeUserAgent() {
      devTools
          .getDomains()
          .network()
          .setUserAgent(
              new Network.UserAgent("Camembert 1.0")
                  .platform("FreeBSD")
                  .acceptLanguage("da, en-gb, *"));
      driver.get(appServer.whereIs("/echo"));
  
      Map<String, String> headers =
          driver.findElements(By.cssSelector("#headers tr")).stream()
              .map(row -> row.findElements(By.tagName("td")))
              .collect(
                  Collectors.toMap(cells -> cells.get(0).getText(), cells -> cells.get(1).getText()));
      assertThat(headers)
          .containsEntry("User-Agent", "Camembert 1.0")
          .containsEntry("Accept-Language", "da, en-gb;q=0.9, *;q=0.8");
  
      Object platform =
          ((JavascriptExecutor) driver).executeScript("return window.navigator.platform");
      assertThat(platform).isEqualTo("FreeBSD");
    }
  }
  