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.environment.webserver;
  
  import static org.openqa.selenium.remote.http.Contents.utf8String;
  
  import java.io.UncheckedIOException;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  class PageHandler implements HttpHandler {
  
    @Override
    public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
  
      int lastIndex = req.getUri().lastIndexOf('/');
      String pageNumber = (lastIndex == -1 ? "Unknown" : req.getUri().substring(lastIndex + 1));
      String body =
          String.format(
              "<html><head><title>Page%s</title></head>"
                  + "<body>Page number <span id=\"pageNumber\">%s</span>"
                  + "<p><a href=\"../xhtmlTest.html\" target=\"_top\">top</a>"
                  + "</body></html>",
              pageNumber, pageNumber);
  
      return new HttpResponse().setHeader("Content-Type", "text/html").setContent(utf8String(body));
    }
  }
  