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    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * 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
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
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   */
  
  package org.apache.hc.core5.testing.reactive;
  
  import java.io.IOException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.nio.ByteBuffer;
  
  import org.apache.hc.core5.function.Callback;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.HeaderElements;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpHeaders;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.MethodNotSupportedException;
  import org.apache.hc.core5.http.ProtocolException;
  import org.apache.hc.core5.http.impl.BasicEntityDetails;
  import org.apache.hc.core5.http.message.BasicHeader;
  import org.apache.hc.core5.http.message.BasicHttpResponse;
  import org.apache.hc.core5.http.nio.ResponseChannel;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.reactive.ReactiveRequestProcessor;
  import org.reactivestreams.Publisher;
  
  import io.reactivex.Flowable;
  
  public class ReactiveRandomProcessor implements ReactiveRequestProcessor {
      public ReactiveRandomProcessor() {
      }
  
      @Override
      public void processRequest(
              final HttpRequest request,
              final EntityDetails entityDetails,
              final ResponseChannel responseChannel,
              final HttpContext context,
              final Publisher<ByteBuffer> requestBody,
              final Callback<Publisher<ByteBuffer>> responseBodyCallback
      ) throws HttpException, IOException {
          final String method = request.getMethod();
          if (!"GET".equalsIgnoreCase(method) &&
                  !"HEAD".equalsIgnoreCase(method) &&
                  !"POST".equalsIgnoreCase(method) &&
                  !"PUT".equalsIgnoreCase(method)) {
              throw new MethodNotSupportedException(method + " not supported by " + getClass().getName());
          }
          final URI uri;
          try {
              uri = request.getUri();
          } catch (final URISyntaxException ex) {
              throw new ProtocolException(ex.getMessage(), ex);
          }
          final String path = uri.getPath();
          final int slash = path.lastIndexOf('/');
          if (slash != -1) {
              final String payload = path.substring(slash + 1);
              final long n;
              if (!payload.isEmpty()) {
                  try {
                      n = Long.parseLong(payload);
                  } catch (final NumberFormatException ex) {
                      throw new ProtocolException("Invalid request path: " + path);
                  }
              } else {
                  // random length, but make sure at least something is sent
                  n = 1 + (int) (Math.random() * 79.0);
              }
  
              if (new BasicHeader(HttpHeaders.EXPECT, HeaderElements.CONTINUE).equals(request.getHeader(HttpHeaders.EXPECT))) {
                  responseChannel.sendInformation(new BasicHttpResponse(100), context);
             }
 
             final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_OK);
             final Flowable<ByteBuffer> stream = ReactiveTestUtils.produceStream(n);
             final String hash = ReactiveTestUtils.getStreamHash(n);
             response.addHeader("response-hash-code", hash);
             final BasicEntityDetailsls.html#BasicEntityDetails">BasicEntityDetails basicEntityDetails = new BasicEntityDetails(n, ContentType.APPLICATION_OCTET_STREAM);
             responseChannel.sendResponse(response, basicEntityDetails, context);
             responseBodyCallback.execute(stream);
         } else {
             throw new ProtocolException("Invalid request path: " + path);
         }
     }
 }