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   /*
    * Copyright 2020 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.http.websocketx;
  
  import io.netty.handler.codec.http.DefaultHttpResponse;
  import io.netty.handler.codec.http.FullHttpResponse;
  import io.netty.handler.codec.http.HttpResponse;
  import io.netty.util.ReferenceCounted;
  
  /**
   * Client exception during handshaking process.
   *
   *  <p><b>IMPORTANT</b>: This exception does not contain any {@link ReferenceCounted} fields
   *  e.g. {@link FullHttpResponse}, so no special treatment is needed.
   */
  public final class WebSocketClientHandshakeException extends WebSocketHandshakeException {
  
      private static final long serialVersionUID = 1L;
  
      private final HttpResponse response;
  
      public WebSocketClientHandshakeException(String message) {
          this(message, null);
      }
  
      public WebSocketClientHandshakeException(String message, HttpResponse httpResponse) {
          super(message);
          if (httpResponse != null) {
              response = new DefaultHttpResponse(httpResponse.protocolVersion(),
                                                 httpResponse.status(), httpResponse.headers());
          } else {
              response = null;
          }
      }
  
      /**
       * Returns a {@link HttpResponse response} if exception occurs during response validation otherwise {@code null}.
       */
      public HttpResponse response() {
          return response;
      }
  }