Connection Error io.netty.handler.codec.http2.Http2Exception: HTTP/2 client preface string missing or corrupt. Hex dump for received bytes:

grpc grpc-java
Gayathri picture Gayathri · Aug 8, 2017 · Viewed 9.8k times · Source

Working on Grpc Bidirectional Streaming, when i try to run grpc, getting below error

Connection Error
io.netty.handler.codec.http2.Http2Exception: HTTP/2 client preface string missing or corrupt. Hex dump for received bytes: at io.netty.handler.codec.http2.Http2Exception.connectionError(Http2Exception.java:82)
    at io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.readClientPrefaceString(Http2ConnectionHandler.java:322)
    at io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.decode(Http2ConnectionHandler.java:263)
    at io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:445)
    at io.netty.handler.codec.ByteToMessageDecoder.decodeLast(ByteToMessageDecoder.java:382)
    at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:286)
    at io.netty.handler.codec.http2.Http2ConnectionHandler.channelInactive(Http2ConnectionHandler.java:421)
    at io.grpc.netty.NettyServerHandler.channelInactive(NettyServerHandler.java:227)
    at io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelInactiveNow(ChannelHandlerInvokerUtil.java:56)
    at io.netty.channel.DefaultChannelHandlerInvoker.invokeChannelInactive(DefaultChannelHandlerInvoker.java:92)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:135)
    at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:928)
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:674)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:339)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:356)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:742)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)

What could be the issue?

Answer

John Hart picture John Hart · Sep 8, 2017

One thing to be aware of there is the difference between the default behavior of NettyServerBuilder and ManagedChannelBuilder w/r/t plaintext.

If you don't enable TLS on the server (eg, by calling sslContext() or useTransportSecurity() on the server builder), then you must call ManagedChannelBuilder.usePlaintext(true) on any channel connecting to the server.

So, in other words, a server is fine defaulting to plaintext, but for channels you need to call usePlaintext() to allow communication with plaintext servers. If not, you'll get this exact HTTP/2 client preface string missing or corrupt exception (although, in my case, with a particular string of bytes following the hexdump).

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