Constant

The constant language is a trivial built-in language that is used to specify a plain text string. This makes it possible to provide a plain text string in any context where an expression type is expected.

In XML, you can set the username header to the value, Jane Doe as follows:

<camelContext>
  <route>
    <from uri="SourceURL"/>
    <setHeader headerName="username">
      <constant>Jane Doe</constant>
    </setHeader>
    <to uri="TargetURL"/>
  </route>
</camelContext>

In Java, you can set the username header to the value, Jane Doe as follows:

from("SourceURL")
  .setHeader("username", constant("Jane Doe"))
  .to("TargetURL");