Unable to capture DecoderException (`TooLongHttpLineException`)

Expected behavior

Be able to capture DecodeExceptions (example TooLongHttpLineException) in a similar way other exceptions can be captured, like ChannelInboundHandler.exceptionCaught.

Actual behavior

Based on what I 've seen, exceptions happening in HttpObjectDecoder like this https://github.com/netty/netty/blob/5256f3628c553081e674f7b27e93a97350141715/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L973-L985 are just swallowed in:

• https://github.com/netty/netty/blob/5256f3628c553081e674f7b27e93a97350141715/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L277
• https://github.com/reactor/reactor-netty/blob/61b761c212fd06f578ac1017071bf3782c149caf/reactor-netty-http/src/main/java/reactor/netty/http/server/HttpServerOperations.java#L743-L745

Steps to reproduce

Minimal yet complete reproducer code (or URL to code)

See https://github.com/abelsromero/netty-runner

Netty version

1.0.22

JVM version (e.g. java -version)

openjdk version “17.0.3.1” 2022-04-22 LTS

OS version (e.g. uname -a)

Darwin romeroab-a01.vmware.com 21.5.0 Darwin Kernel Version 21.5.0 root:xnu-8020.121.3~4/RELEASE_X86_64 x86_64

[abelsromero]

Thanks a lot! I could finally make it work with (updated the reproducer with a new commit with it)

		@Override
		public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
			if (msg instanceof DecoderResultProvider request) {
				DecoderResult decoderResult = request.decoderResult();
				if (decoderResult.isFailure()) {
					Throwable cause = decoderResult.cause();
					System.out.println(cause);
				}
			}
			super.channelRead(ctx, msg);
		}

[violetagg]

@abelsromero I’ll encourage you to ask your question here https://gitter.im/reactor/reactor-netty