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.netty;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import org.asynchttpclient.AsyncHttpClient;
  import org.asynchttpclient.Response;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.remote.http.ClientConfig;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.http.HttpResponse;
  import org.openqa.selenium.remote.http.RemoteCall;
  
  public class NettyHttpHandler extends RemoteCall {
  
    private final HttpHandler handler;
    private final AsyncHttpClient client;
  
    public NettyHttpHandler(ClientConfig config, AsyncHttpClient client) {
      super(config);
      this.client = client;
      this.handler = config.filter().andFinally(this::makeCall);
    }
  
    @Override
    public HttpResponse execute(HttpRequest request) {
      return handler.execute(request);
    }
  
    private HttpResponse makeCall(HttpRequest request) {
      Require.nonNull("Request", request);
  
      Future<Response> whenResponse =
          client.executeRequest(NettyMessages.toNettyRequest(getConfig(), request));
  
      try {
        Response response =
            whenResponse.get(getConfig().readTimeout().toMillis(), TimeUnit.MILLISECONDS);
        return NettyMessages.toSeleniumResponse(response);
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        throw new RuntimeException("NettyHttpHandler request interrupted", e);
      } catch (TimeoutException e) {
        throw new org.openqa.selenium.TimeoutException(e);
      } catch (ExecutionException e) {
        Throwable cause = e.getCause();
        if (cause instanceof UncheckedIOException) {
          throw (UncheckedIOException) cause;
        }
  
        if (cause instanceof IOException) {
          throw new UncheckedIOException((IOException) cause);
        }
  
        throw new RuntimeException("NettyHttpHandler request execution error", e);
      }
    }
  }
  