@Override
	public Object fromMessage(Message<?> message, Class<?> targetClass) {
		throw new UnsupportedOperationException("This converter is for inbound messages only.");
	}
Message converter (inbound only) to convert a Netty Http MessageEvent to
a Message. Returns null if the content is not readable.

@author Mark Fisher
@author Jennifer Hickey
@author Gary Russell
@author Marius Bogoevici
@author Peter Rietzler
extensions/spring-xd-extension-http/src/main/java/org/springframework/integration/x/http/NettyInboundMessageConverter.java