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1   /*
2    * Copyright 2016 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.handler.codec.http2;
18  
19  import io.netty.buffer.ByteBuf;
20  import io.netty.buffer.ByteBufHolder;
21  import io.netty.util.internal.UnstableApi;
22  
23  /**
24   * HTTP/2 PING Frame.
25   */
26  @UnstableApi
27  public interface Http2PingFrame extends Http2Frame, ByteBufHolder {
28  
29      /**
30       * When {@code true}, indicates that this ping is a ping response.
31       */
32      boolean ack();
33  
34      /**
35       * Returns the eight byte opaque data.
36       */
37      @Override
38      ByteBuf content();
39  }