Header

Since Camel 1.5

The Header Expression Language allows you to extract values of named headers.

Header Options

The Header language supports 1 options, which are listed below.

Name Default Java Type Description

Name	Default	Java Type	Description
trim (advanced)	`true`	`Boolean`	Whether to trim the source code to remove leading and trailing whitespaces and line breaks. For example when using DSLs where the source will span across multiple lines and there may be additional line breaks at both the beginning and end.

trim (advanced)

true

Boolean

Whether to trim the source code to remove leading and trailing whitespaces and line breaks. For example when using DSLs where the source will span across multiple lines and there may be additional line breaks at both the beginning and end.

Example usage

The recipientList EIP can utilize a header:

Java
XML
YAML

from("direct:a").recipientList(header("myHeader"));

<route>
  <from uri="direct:a" />
  <recipientList>
    <header>myHeader</header>
  </recipientList>
</route>

- route:
    from:
      uri: direct:a
      steps:
        - recipientList:
            expression:
              header:
                expression: myHeader

In this case, the list of recipients are contained in the header 'myHeader'.

Dependencies

The Header language is part of camel-core.