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.remote.http;
  
  import java.util.List;
  import java.util.stream.Collectors;
  import org.openqa.selenium.internal.Require;
  
  public class UrlPath {
  
    static final String ROUTE_PREFIX_KEY = "selenium.route";
  
    private UrlPath() {
      // Utility class
    }
  
    public static String relativeToServer(HttpRequest req, String location) {
      return Require.nonNull("Location", location);
    }
  
    public static String relativeToContext(HttpRequest req, String location) {
      Require.nonNull("Location", location);
  
      Object rawPrefix = req.getAttribute(ROUTE_PREFIX_KEY);
      String prefix;
      if (rawPrefix instanceof List) {
        prefix = ((List<?>) rawPrefix).stream().map(String::valueOf).collect(Collectors.joining());
      } else {
        prefix = "";
      }
  
      return prefix + location;
    }
  }
  