@carryxyh I find the code ChannelHandler when it use, It is not injected
through @SPI
See NettyClient.java :
```
@Override
protected void doOpen() throws Throwable {
final NettyClientHandler nettyClientHandler = new
NettyClientHandler(getUrl(), this);
bootstrap = new Bootstrap();
bootstrap.group(nioEventLoopGroup)
.option(ChannelOption.SO_KEEPALIVE, true)
.option(ChannelOption.TCP_NODELAY, true)
.option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
//.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, getTimeout())
.channel(NioSocketChannel.class);
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2398 ]
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