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 java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.io.Writer;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.Map;
  import org.openqa.selenium.json.Json;
  import org.openqa.selenium.remote.http.Contents;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  
  /**
   * Simple API to create pages on server. Request format (JSON): {"content" : "... code of the
   * page..."} Response body contains the address of the created page.
   */
  class CreatePageHandler implements HttpHandler {
  
    private final Path tempPageDir;
    private final String hostname;
    private final int port;
    private final String path;
  
    public CreatePageHandler(Path tempPageDir, String hostname, int port, String path) {
      this.tempPageDir = tempPageDir;
      this.hostname = hostname;
      this.port = port;
      this.path = path;
    }
  
    @Override
    public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
      String content = Contents.string(req);
      Map<String, String> json = new Json().toType(content, Json.MAP_TYPE);
  
      try {
        Path target = Files.createTempFile(tempPageDir, "page", ".html");
        try (Writer out = Files.newBufferedWriter(target, UTF_8)) {
          out.write(json.get("content"));
        }
  
        return new HttpResponse()
            .setHeader("Content-Type", "text/plain")
            .setContent(
                Contents.utf8String(
                    String.format(
                        "http://%s:%d/common%s/%s", hostname, port, path, target.getFileName())));
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      }
    }
  }
  