| [[header-language]] |
| = Header Language |
| :page-source: core/camel-base/src/main/docs/header-language.adoc |
| |
| *Available as of Camel version 1.5* |
| |
| The Header Expression Language allows you to extract values of named |
| headers. |
| |
| == Header Options |
| |
| // language options: START |
| The Header language supports 1 options, which are listed below. |
| |
| |
| |
| [width="100%",cols="2,1m,1m,6",options="header"] |
| |=== |
| | Name | Default | Java Type | Description |
| | trim | true | Boolean | Whether to trim the value to remove leading and trailing whitespaces and line breaks |
| |=== |
| // language options: END |
| |
| == Example usage |
| |
| 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) |
| |
| [source,java] |
| ---- |
| from("direct:a").recipientList().header("myHeader"); |
| ---- |
| |
| == Dependencies |
| |
| The Header language is part of *camel-core*. |
