Since we're on a major migration process of this website, some component documents here are out of sync right now. In the meantime you may want to look at the asciidoc in the repository: https://github.com/apache/camel/blob/master/README.md https://github.com/apache/camel/blob/master/components/readme.adoc
Header Expression Language
The Header Expression Language allows you to extract values of named headers.
The recipientList element of the Spring DSL can utilize a header expression like:
In this case, the list of recipients are contained in the header 'myHeader'.
And the same example in Java DSL:
And with a slightly different syntax where you use the builder to the fullest (i.e. avoid using parameters but using stacked operations, notice that header is not a parameter but a stacked method call)
The Header language is part of camel-core.