How to use several headers in expression?

[dirooster]

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How can I use several headers in one expression as an idempotent Key?
How can I use something like this expression: > "${header.CamelFilePath}-${header.CamelFileLength}-${header.CamelFileLastModified}"

Route sample:

• route:
  id: route-516f
  nodePrefixId: route-cc1
  from:
  id: from-ccda
  uri: file
  parameters:
  directoryName: /Users/User1/Desktop/from
  steps:
  - log:
  id: log-a21d
  message: >-
  This is idempotent place - Step01. Body: ${body}. Headers:
  ${headers}
  - idempotentConsumer:
  id: idempotentConsumer-8e61
  expression:
  csimple:
  id: csimple-921e
  expression: >-
  ${header.CamelFilePath}
  idempotentRepository: >-
  #class:org.apache.camel.support.processor.idempotent.MemoryIdempotentRepository
  - log:
  id: log-a4a5
  message: >-
  This is idempotent place - Step02. Body: ${body}. Headers:
  ${headers}
  - to:
  id: to-23b2
  uri: file
  parameters:
  directoryName: /Users/User1/Desktop/to
• routeConfiguration:
  errorHandler:
  id: errorHandler-db04
  deadLetterChannel:
  id: deadLetterChannel-b2ac
  redeliveryPolicy:
  id: redeliveryPolicy-35e2
  maximumRedeliveries: 20
  redeliveryDelay: "200"
  backOffMultiplier: 2

Variant

Web Application

Container Management (if applicable)

Docker

Operating System (if applicable)

MacOS

Version

4.8.0

[davsclaus]

use simple and just type multiple in a single line

[dirooster]

without commas?
this one doesn't work

${header.CamelFilePath}, ${header.CamelFileLength}, ${header.CamelFileLastModified}

[dirooster]

I use this one: ${header.CamelFilePath}${header.CamelFileLength}${header.CamelFileLastModified}
But idempotent consumer doesn't find a duplicate, even though it is duplicate

11:57:05.354 [Camel (camel-1) thread #1 - KafkaIdempotentRepositorySync] DEBUG r.s.s.c.m.KafkaIdempotentRepository - Adding to cache messageId:/Users/User1/Desktop/from/SendFileInfoNf.xml5171737622622284
11:57:05.355 [Camel (camel-1) thread #2 - KafkaIdempotentRepositorySync] DEBUG r.s.s.c.m.KafkaIdempotentRepository - Adding to cache messageId:/Users//User1/Desktop/from/SendFileInfoNf.xml5171737622622284

[dirooster]

@davsclaus , maybe you could share the correct spelling of expression?

[dirooster]

${header.CamelFilePath}${header.CamelFileLength}${header.CamelFileLastModified}