1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27 package org.apache.hc.core5.http2.examples;
28
29 import java.util.List;
30 import java.util.concurrent.CountDownLatch;
31 import java.util.concurrent.Future;
32
33 import org.apache.hc.core5.concurrent.FutureCallback;
34 import org.apache.hc.core5.http.Header;
35 import org.apache.hc.core5.http.HttpConnection;
36 import org.apache.hc.core5.http.HttpHost;
37 import org.apache.hc.core5.http.HttpResponse;
38 import org.apache.hc.core5.http.Message;
39 import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncRequester;
40 import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
41 import org.apache.hc.core5.http.nio.entity.StringAsyncEntityConsumer;
42 import org.apache.hc.core5.http.nio.support.AsyncRequestBuilder;
43 import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
44 import org.apache.hc.core5.http2.HttpVersionPolicy;
45 import org.apache.hc.core5.http2.config.H2Config;
46 import org.apache.hc.core5.http2.frame.RawFrame;
47 import org.apache.hc.core5.http2.impl.nio.H2StreamListener;
48 import org.apache.hc.core5.http2.impl.nio.bootstrap.H2RequesterBootstrap;
49 import org.apache.hc.core5.io.CloseMode;
50 import org.apache.hc.core5.util.Timeout;
51
52
53
54
55 public class H2RequestExecutionExample {
56
57 public static void main(final String[] args) throws Exception {
58
59
60 final H2Config h2Config = H2Config.custom()
61 .setPushEnabled(false)
62 .build();
63
64 final HttpAsyncRequester requester = H2RequesterBootstrap.bootstrap()
65 .setH2Config(h2Config)
66 .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
67 .setStreamListener(new H2StreamListener() {
68
69 @Override
70 public void onHeaderInput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
71 for (int i = 0; i < headers.size(); i++) {
72 System.out.println(connection.getRemoteAddress() + " (" + streamId + ") << " + headers.get(i));
73 }
74 }
75
76 @Override
77 public void onHeaderOutput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
78 for (int i = 0; i < headers.size(); i++) {
79 System.out.println(connection.getRemoteAddress() + " (" + streamId + ") >> " + headers.get(i));
80 }
81 }
82
83 @Override
84 public void onFrameInput(final HttpConnection connection, final int streamId, final RawFrame frame) {
85 }
86
87 @Override
88 public void onFrameOutput(final HttpConnection connection, final int streamId, final RawFrame frame) {
89 }
90
91 @Override
92 public void onInputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
93 }
94
95 @Override
96 public void onOutputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
97 }
98
99 })
100 .create();
101 Runtime.getRuntime().addShutdownHook(new Thread(() -> {
102 System.out.println("HTTP requester shutting down");
103 requester.close(CloseMode.GRACEFUL);
104 }));
105 requester.start();
106
107 final HttpHost target = new HttpHost("nghttp2.org");
108 final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};
109
110 final CountDownLatch latch = new CountDownLatch(requestUris.length);
111 for (final String requestUri: requestUris) {
112 final Future<AsyncClientEndpoint> future = requester.connect(target, Timeout.ofSeconds(5));
113 final AsyncClientEndpoint clientEndpoint = future.get();
114 clientEndpoint.execute(
115 AsyncRequestBuilder.get()
116 .setHttpHost(target)
117 .setPath(requestUri)
118 .build(),
119 new BasicResponseConsumer<>(new StringAsyncEntityConsumer()),
120 new FutureCallback<Message<HttpResponse, String>>() {
121
122 @Override
123 public void completed(final Message<HttpResponse, String> message) {
124 clientEndpoint.releaseAndReuse();
125 final HttpResponse response = message.getHead();
126 final String body = message.getBody();
127 System.out.println(requestUri + "->" + response.getCode());
128 System.out.println(body);
129 latch.countDown();
130 }
131
132 @Override
133 public void failed(final Exception ex) {
134 clientEndpoint.releaseAndDiscard();
135 System.out.println(requestUri + "->" + ex);
136 latch.countDown();
137 }
138
139 @Override
140 public void cancelled() {
141 clientEndpoint.releaseAndDiscard();
142 System.out.println(requestUri + " cancelled");
143 latch.countDown();
144 }
145
146 });
147 }
148
149 latch.await();
150 System.out.println("Shutting down I/O reactor");
151 requester.initiateShutdown();
152 }
153
154 }