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https://issues.apache.org/jira/browse/CAMEL-17796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17506843#comment-17506843
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Nicolas Filotto commented on CAMEL-17796:
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About your comment, the message headers to document could also be read not only 
added.

> camel-core - SPI annotations for message headers to include in/out direction
> ----------------------------------------------------------------------------
>
>                 Key: CAMEL-17796
>                 URL: https://issues.apache.org/jira/browse/CAMEL-17796
>             Project: Camel
>          Issue Type: New Feature
>          Components: camel-core
>            Reporter: Claus Ibsen
>            Priority: Major
>             Fix For: 3.16.0
>
>
> Message headers can be used as input, output or both. (Maybe need a better 
> term)
> Input means input to a producer.
> And output means output from a consumer.
> For example the FILE_NAME header is both input and output, as input its used 
> to control what name to write the file as. And as output its the actual file 
> name the consumer has read.
> The timer component only has output headers, eg the fired time and so on.
> It would be good to have a way to mark this in the annotation and also 
> generate that information in the json file, so we know and have it available 
> for tooling and the website documentation.



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