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Chapter 12. Constant

Overview
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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.

XML example
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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>
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Java example
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In Java, you can set the username header to the value, Jane Doe as follows: 
from("SourceURL")
  .setHeader("username", constant("Jane Doe"))
  .to("TargetURL");
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