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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
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13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
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27  package org.apache.hc.client5.http.examples;
28  
29  import java.nio.ByteBuffer;
30  import java.nio.CharBuffer;
31  import java.util.concurrent.Future;
32  
33  import org.apache.hc.client5.http.async.methods.AbstractBinPushConsumer;
34  import org.apache.hc.client5.http.async.methods.AbstractCharResponseConsumer;
35  import org.apache.hc.client5.http.config.TlsConfig;
36  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
37  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
38  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
39  import org.apache.hc.core5.function.Supplier;
40  import org.apache.hc.core5.http.ContentType;
41  import org.apache.hc.core5.http.HttpRequest;
42  import org.apache.hc.core5.http.HttpResponse;
43  import org.apache.hc.core5.http.impl.routing.RequestRouter;
44  import org.apache.hc.core5.http.message.BasicHttpRequest;
45  import org.apache.hc.core5.http.message.StatusLine;
46  import org.apache.hc.core5.http.nio.AsyncPushConsumer;
47  import org.apache.hc.core5.http.nio.support.BasicRequestProducer;
48  import org.apache.hc.core5.http.support.BasicRequestBuilder;
49  import org.apache.hc.core5.http2.HttpVersionPolicy;
50  import org.apache.hc.core5.http2.config.H2Config;
51  import org.apache.hc.core5.io.CloseMode;
52  
53  /**
54   * This example demonstrates handling of HTTP/2 message exchanges pushed by the server.
55   */
56  public class AsyncClientH2ServerPush {
57  
58      public static void main(final String[] args) throws Exception {
59  
60          final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
61                  .setH2Config(H2Config.custom()
62                          .setPushEnabled(true)
63                          .build())
64                  .setConnectionManager(PoolingAsyncClientConnectionManagerBuilder.create()
65                          .setDefaultTlsConfig(TlsConfig.custom()
66                                  .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
67                                  .build())
68                          .build())
69                  .build();
70  
71          client.start();
72  
73          final RequestRouter<Supplier<AsyncPushConsumer>> pushRequestRouter = RequestRouter.<Supplier<AsyncPushConsumer>>builder()
74                  // Route all requests to the local authority
75                  .resolveAuthority(RequestRouter.LOCAL_AUTHORITY_RESOLVER)
76                  // Use the same route for all requests
77                  .addRoute(RequestRouter.LOCAL_AUTHORITY, "*", () -> new AbstractBinPushConsumer() {
78  
79                      @Override
80                      protected void start(
81                              final HttpRequest promise,
82                              final HttpResponse response,
83                              final ContentType contentType) {
84                          System.out.println(promise.getPath() + " (push)->" + new StatusLine(response));
85                      }
86  
87                      @Override
88                      protected int capacityIncrement() {
89                          return Integer.MAX_VALUE;
90                      }
91  
92                      @Override
93                      protected void data(final ByteBuffer data, final boolean endOfStream) {
94                      }
95  
96                      @Override
97                      protected void completed() {
98                      }
99  
100                     @Override
101                     public void failed(final Exception cause) {
102                         System.out.println("(push)->" + cause);
103                     }
104 
105                     @Override
106                     public void releaseResources() {
107                     }
108 
109                 })
110                 .build();
111 
112         final BasicHttpRequest request = BasicRequestBuilder.get("https://nghttp2.org/httpbin/").build();
113 
114         System.out.println("Executing request " + request);
115         final Future<Void> future = client.execute(
116                 new BasicRequestProducer(request, null),
117                 new AbstractCharResponseConsumer<Void>() {
118 
119                     @Override
120                     protected void start(
121                             final HttpResponse response,
122                             final ContentType contentType) {
123                         System.out.println(request + "->" + new StatusLine(response));
124                     }
125 
126                     @Override
127                     protected int capacityIncrement() {
128                         return Integer.MAX_VALUE;
129                     }
130 
131                     @Override
132                     protected void data(final CharBuffer data, final boolean endOfStream) {
133                     }
134 
135                     @Override
136                     protected Void buildResult() {
137                         return null;
138                     }
139 
140                     @Override
141                     public void failed(final Exception cause) {
142                         System.out.println(request + "->" + cause);
143                     }
144 
145                     @Override
146                     public void releaseResources() {
147                     }
148 
149                 },
150                 HttpAsyncClients.pushRouter(pushRequestRouter),
151                 null,
152                 null);
153         future.get();
154 
155         System.out.println("Shutting down");
156         client.close(CloseMode.GRACEFUL);
157     }
158 
159 }