如何在使用 Spring Cloud Stream 发布到 Kafka 主题之前向消息添加标头

Question

I just realised that the message once received on Kafka Topic looses the headers. Is there a way to add headers to the message before posting it to Kafka Topic and then read it at the consumer? I am using Java 11, Spring Cloud Hoxton.SR6, Spring 2.2.4, kafka_2.13-2.6.0. Thanks in advance!

Answer 1

I think posted the question a little too early. Its pretty simple. Get the request headers from HttpServletRequest or HttpRequest(spring) and then while writing to the MessageChannel, call the CopyHeaders method while passing the headers. You can also skip the ones which are not needed. At the consumer, instead of a Custom Object, get the Message object which has all the headers

Producer MessageBuilder.withPayload(message).copyHeaders(headersMap).build(); Consumer processMessage(Message<?> message)