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   /*
    * Copyright 2013 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.example.http.cors;
  
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelFutureListener;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.handler.codec.http.DefaultFullHttpResponse;
  import io.netty.handler.codec.http.FullHttpResponse;
  import io.netty.handler.codec.http.HttpResponseStatus;
  import io.netty.handler.codec.http.HttpVersion;
  
  /**
   * A simple handler which will simple return a successful Http
   * response for any request.
   */
  public class OkResponseHandler extends SimpleChannelInboundHandler<Object> {
      @Override
      public void channelRead0(ChannelHandlerContext ctx, Object msg) {
          final FullHttpResponse response = new DefaultFullHttpResponse(
                  HttpVersion.HTTP_1_1, HttpResponseStatus.OK, Unpooled.EMPTY_BUFFER);
          response.headers().set("custom-response-header", "Some value");
          ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
      }
  }