code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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
   *
   *     http://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 org.apache.skywalking.oap.server.telemetry.prometheus.httpserver;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.http.HttpServerCodec;
  import io.netty.handler.codec.http.HttpServerExpectContinueHandler;
  import io.netty.handler.ssl.SslContext;
  import lombok.RequiredArgsConstructor;
  
  @RequiredArgsConstructor
  public class HttpServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private final SslContext sslCtx;
  
      @Override
      public void initChannel(SocketChannel ch) {
          ChannelPipeline p = ch.pipeline();
          if (sslCtx != null) {
              p.addLast(sslCtx.newHandler(ch.alloc()));
          }
          p.addLast(new HttpServerCodec());
          p.addLast(new HttpServerExpectContinueHandler());
          p.addLast(new HttpServerHandler());
      }
  }
  