karavan-core/test/routes1.yaml

- route:
    from:
      uri: timer:info
      steps:
        - choice:
            when:
              - expression:
                  simple:
                    expression: ${headers} != null
                steps:
                  - log:
                      message: hello11
                      logName: log11
              - expression:
                  simple:
                    expression: ${headers} == null
                steps:
                  - log:
                      message: hello22s
                      logName: log22