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;
  
  import java.util.Optional;
  
  public class HttpSessionId {
  
    private HttpSessionId() {
      // Utility class
    }
  
    /**
     * Scan {@code uri} for a session ID. This is identified by scanning for "{code /session/}" and
     * then extracting the next fragment of the URL. This means that both "{@code /session/foo}" and
     * "{@code /wd/hub/session/foo/bar}" would both identify the session id as being "foo".
     */
    public static Optional<String> getSessionId(String uri) {
      int sessionIndex = uri.indexOf("/session/");
      if (sessionIndex != -1) {
        sessionIndex += "/session/".length();
        int nextSlash = uri.indexOf("/", sessionIndex);
        if (nextSlash != -1) {
          return Optional.of(uri.substring(sessionIndex, nextSlash));
        }
        return Optional.of(uri.substring(sessionIndex));
      }
      return Optional.empty();
    }
  }
  