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.Locale;
  import org.openqa.selenium.BuildInfo;
  import org.openqa.selenium.Platform;
  
  public class AddSeleniumUserAgent implements Filter {
  
    public static final String USER_AGENT =
        String.format(
            "selenium/%s (java %s)",
            new BuildInfo().getReleaseLabel(),
            (Platform.getCurrent().family() == null
                ? Platform.getCurrent().toString().toLowerCase(Locale.US)
                : Platform.getCurrent().family().toString().toLowerCase(Locale.US)));
  
    @Override
    public HttpHandler apply(HttpHandler next) {
  
      return req -> {
        if (req.getHeader("User-Agent") == null) {
          req.addHeader("User-Agent", USER_AGENT);
        }
  
        return next.execute(req);
      };
    }
  }
  