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   /*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project 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:
    *
    * https://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.
   */
  package io.netty.handler.codec.http2;
  
  import io.netty.util.internal.UnstableApi;
  
  /**
   * Signifies that the <a href="https://tools.ietf.org/html/rfc7540#section-3.5">connection preface</a> and
   * the initial SETTINGS frame have been sent. The client sends the preface, and the server receives the preface.
   * The client shouldn't write any data until this event has been processed.
   */
  @UnstableApi
  public final class Http2ConnectionPrefaceAndSettingsFrameWrittenEvent {
      static final Http2ConnectionPrefaceAndSettingsFrameWrittenEvent INSTANCE =
              new Http2ConnectionPrefaceAndSettingsFrameWrittenEvent();
  
      private Http2ConnectionPrefaceAndSettingsFrameWrittenEvent() {
      }
  }