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    * Licensed to the Apache Software Foundation (ASF) under one
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    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
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  package org.apache.hc.client5.testing.async;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import java.util.concurrent.Future;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
  import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
  import org.apache.hc.client5.http.impl.DefaultHttpRequestRetryStrategy;
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.core5.function.Resolver;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.testing.nio.H2TestServer;
  import org.apache.hc.core5.util.TimeValue;
  import org.hamcrest.CoreMatchers;
  import org.junit.jupiter.api.Test;
  
  public abstract class TestHttp1RequestReExecution extends AbstractIntegrationTestBase {
  
      public TestHttp1RequestReExecution(final URIScheme scheme) {
          super(scheme);
      }
  
      protected H2TestServer startServer() throws Exception {
          final Resolver<HttpRequest, TimeValue> serviceAvailabilityResolver = new Resolver<HttpRequest, TimeValue>() {
  
              private final AtomicInteger count = new AtomicInteger(0);
  
              @Override
              public TimeValue resolve(final HttpRequest request) {
                  final int n = count.incrementAndGet();
                  return n <= 3 ? TimeValue.ofSeconds(1) : null;
              }
  
          };
  
          return startServer(Http1Config.DEFAULT, null, handler ->
                  new ServiceUnavailableAsyncDecorator(handler, serviceAvailabilityResolver));
      }
  
      @Test
      public void testGiveUpAfterOneRetry() throws Exception {
          final H2TestServer server = startServer();
          server.register("/random/*", AsyncRandomHandler::new);
          final HttpHost target = targetHost();
  
          final CloseableHttpAsyncClient client = startClient(builder -> builder
                  .setRetryStrategy(new DefaultHttpRequestRetryStrategy(1, TimeValue.ofSeconds(1))));
  
          final Future<SimpleHttpResponse> future = client.execute(
                  SimpleRequestBuilder.get()
                          .setHttpHost(target)
                          .setPath("/random/2048")
                          .build(), null);
          final SimpleHttpResponse response = future.get();
          assertThat(response, CoreMatchers.notNullValue());
          assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_SERVICE_UNAVAILABLE));
      }
  
      @Test
      public void testDoNotGiveUpEasily() throws Exception {
          final H2TestServer server = startServer();
          server.register("/random/*", AsyncRandomHandler::new);
          final HttpHost target = targetHost();
  
          final CloseableHttpAsyncClient client = startClient(builder -> builder
                  .setRetryStrategy(new DefaultHttpRequestRetryStrategy(5, TimeValue.ofSeconds(1))));
  
         final Future<SimpleHttpResponse> future = client.execute(
                 SimpleRequestBuilder.get()
                         .setHttpHost(target)
                         .setPath("/random/2048")
                         .build(), null);
         final SimpleHttpResponse response = future.get();
         assertThat(response, CoreMatchers.notNullValue());
         assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_OK));
     }
 
 }