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
12 *
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
24 * <http://www.apache.org/>.
25 *
26 */
27 package org.apache.hc.core5.http2;
28
29 import java.util.concurrent.ConcurrentHashMap;
30 import java.util.concurrent.ConcurrentMap;
31
32 /**
33 * Errors codes defined by HTTP/2 specification.
34 *
35 * @since 5.0
36 */
37 public enum H2Error {
38
39 /**
40 * Graceful shutdown
41 * <p>
42 * The associated condition is not as a result of an error.
43 */
44 NO_ERROR (0x00),
45
46 /**
47 * Protocol error detected
48 * <p>
49 * The endpoint detected an unspecific protocol error. This error is for use when a more
50 * specific error code is not available
51 */
52 PROTOCOL_ERROR (0x01),
53
54 /**
55 * Implementation fault
56 * <p>
57 * The endpoint encountered an unexpected internal error.
58 */
59 INTERNAL_ERROR (0x02),
60
61 /**
62 * Flow control limits exceeded.
63 * <p>
64 * The endpoint detected that its peer violated the flow control protocol.
65 */
66 FLOW_CONTROL_ERROR (0x03),
67
68 /**
69 * Settings not acknowledged.
70 * <p>
71 * The endpoint sent a SETTINGS frame, but did not receive a response in a timely manner.
72 */
73 SETTINGS_TIMEOUT (0x04),
74
75 /**
76 * Frame received for closed stream.
77 * <p>
78 * The endpoint received a frame after a stream was half closed.
79 */
80 STREAM_CLOSED (0x05),
81
82 /**
83 * Frame size incorrect.
84 * <p>
85 * The endpoint received a frame with an invalid size.
86 */
87 FRAME_SIZE_ERROR (0x06),
88
89 /**
90 * Stream not processed
91 * <p>
92 * The endpoint refuses the stream prior to performing any application processing.
93 */
94 REFUSED_STREAM (0x07),
95
96 /**
97 * Stream canceled.
98 * <p>
99 * Used by the endpoint to indicate that the stream is no longer needed
100 */
101 CANCEL (0x08),
102
103 /**
104 * Compression state not updated.
105 * <p>
106 * The endpoint is unable to maintain the header compression context for the connection.
107 */
108 COMPRESSION_ERROR (0x09),
109
110 /**
111 * TCP connection error.
112 * <p>
113 * The connection established in response to a CONNECT request was reset or abnormally closed.
114 */
115 CONNECT_ERROR (0x0a),
116
117 /**
118 * Processing capacity exceeded.
119 * <p>
120 * The endpoint detected that its peer is exhibiting a behavior that might be generating
121 * excessive load.
122 */
123 ENHANCE_YOUR_CALM (0x0b),
124
125 /**
126 * Negotiated TLS parameters not acceptable.
127 * <p>
128 * The underlying transport has properties that do not meet minimum security requirements.
129 */
130 INADEQUATE_SECURITY (0x0c),
131
132 /**
133 * Use HTTP/1.1 for the request.
134 * <p>
135 * The endpoint requires that HTTP/1.1 be used instead of HTTP/2.
136 */
137 HTTP_1_1_REQUIRED (0x0d);
138
139 int code;
140
141 H2Error(final int code) {
142 this.code = code;
143 }
144
145 public int getCode() {
146 return code;
147 }
148
149 private static final ConcurrentMap<Integer, H2Error> MAP_BY_CODE;
150 static {
151 MAP_BY_CODE = new ConcurrentHashMap<>();
152 for (final H2Error error: values()) {
153 MAP_BY_CODE.putIfAbsent(error.code, error);
154 }
155 }
156
157 public static H2Error getByCode(final int code) {
158 return MAP_BY_CODE.get(code);
159 }
160
161 }