Embedded headers found in Spring Cloud Stream message body - spring

Question

I use Spring Cloud Stream 1.3.2.RELEASE to publish a String message to Kafka. When I consume the message using command line Kafka consumer or Spring Kafka #KafkaListener, a contentType header is always appended to the message body.
Question:
Is there any way to get rid of the embedded headers?
--
Spring Cloud Stream as producer
private void send() {
channel.test().send(MessageBuilder.withPayload("{\"foo\":\"bar\"}").build());
}
Command line Kafka consumer
$ bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test
�
contentType
"text/plain"{"foo":"bar"}
Spring Kafka as consumer
#KafkaListener(topics = "test")
public void receive(Message message){
log.info("Message payload received: {}", message.getPayload());
}
2018-05-16 07:12:05.241 INFO 19475 --- [ntainer#0-0-C-1] com.demo.service.Listener : Message payload received: �contentType"text/plain"{"foo":"bar"}
#KafkaListener(topics = "test")
public void receive(#Payload String message){
log.info("Message payload received: {}", message);
}
2018-05-16 07:16:14.313 INFO 19747 --- [ntainer#0-0-C-1] com.demo.service.Listener : Message payload received: �contentType"text/plain"{"foo":"bar"}

Answer 1

See headerMode binding property: https://docs.spring.io/spring-cloud-stream/docs/Ditmars.SR3/reference/htmlsingle/#_properties_for_use_of_spring_cloud_stream. You need to set it to raw for the destination you send messages.