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.nio.file.Files;
  import java.nio.file.Path;
  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;
  
  class Utf8Handler implements HttpHandler {
  
    private final Path webSrc;
    private final String stripPrefix;
  
    public Utf8Handler(Path webSrc, String stripPrefix) {
      this.webSrc = webSrc;
      this.stripPrefix = stripPrefix;
    }
  
    @Override
    public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
  
      try {
        String fileName = req.getUri();
        if (fileName.startsWith(stripPrefix)) {
          fileName = fileName.substring(stripPrefix.length());
        }
  
        Path target = webSrc.resolve(fileName);
  
        return new HttpResponse()
            .setHeader("Content-Type", "text/html; charset=UTF-8")
            .setContent(Contents.utf8String(new String(Files.readAllBytes(target), UTF_8)));
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      }
    }
  }
  