dubbo-remoting/dubbo-remoting-http3/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyHttp3Server.java [103:134]:
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    protected void doClose() {
        try {
            if (channel != null) {
                // unbind.
                channel.close();
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            Collection<Channel> channels = getChannels();
            if (CollectionUtils.isNotEmpty(channels)) {
                for (Channel channel : channels) {
                    try {
                        channel.close();
                    } catch (Throwable e) {
                        logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
                    }
                }
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        closeBootstrap();
        try {
            if (channels != null) {
                channels.clear();
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
    }
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dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyServer.java [191:222]:
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    protected void doClose() {
        try {
            if (channel != null) {
                // unbind.
                channel.close();
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        try {
            Collection<Channel> channels = getChannels();
            if (CollectionUtils.isNotEmpty(channels)) {
                for (Channel channel : channels) {
                    try {
                        channel.close();
                    } catch (Throwable e) {
                        logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
                    }
                }
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
        closeBootstrap();
        try {
            if (channels != null) {
                channels.clear();
            }
        } catch (Throwable e) {
            logger.warn(TRANSPORT_FAILED_CLOSE, "", "", e.getMessage(), e);
        }
    }
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