什么时候 java.io.IOException: Connection reset by peer 通过 Netty 抛出？
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When is java.io.IOException: Connection reset by peer thrown with Netty?
提问by Karthik S
When I send a request to a webserver using netty. I get the following exception. What can cause this exception ?
当我使用 netty 向网络服务器发送请求时。我得到以下异常。什么会导致这个异常？
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[na:1.7.0_25]
at sun.nio.ch.SocketDispatcher.read(Unknown Source) ~[na:1.7.0_25]
at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source) ~[na:1.7.0_25]
at sun.nio.ch.IOUtil.read(Unknown Source) ~[na:1.7.0_25]
at sun.nio.ch.SocketChannelImpl.read(Unknown Source) ~[na:1.7.0_25]
at io.netty.buffer.UnpooledHeapByteBuf.setBytes(UnpooledHeapByteBuf.java:237) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:867) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:227) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:87) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:497) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:465) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:359) ~[netty-all-4.0.6.Final.jar:na]
at io.netty.util.concurrent.SingleThreadEventExecutor.run(SingleThreadEventExecutor.java:101) ~[netty-all-4.0.6.Final.jar:na]
at java.lang.Thread.run(Unknown Source) ~[na:1.7.0_25]
回答by user207421
The usual cause of this error is that you have written to a connection which had already been closed by the other end. In other words, an application protocol error. There are other causes, but this is the most common.
此错误的常见原因是您已写入已被另一端关闭的连接。换句话说，应用程序协议错误。还有其他原因，但这是最常见的。
NB Netty has nothing to do with it.
NB Netty 与此无关。
回答by Appz
Try check and catch exception before read. It helped me rid of that exception.
在阅读之前尝试检查并捕获异常。它帮助我摆脱了那个例外。
// Attempt to read off the channel
int numRead;
try {
numRead = socketChannel.read(this.readBuffer);
} catch (IOException e) {
// The remote forcibly closed the connection, cancel
// the selection key and close the channel.
key.cancel();
socketChannel.close();
return;
}
