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Chapter 14. Constant
Overview
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
				In XML, you can set the username header to the value, Jane Doe as follows:
			
Java example
				In Java, you can set the username header to the value, Jane Doe as follows:
			
from("SourceURL")
  .setHeader("username", constant("Jane Doe"))
  .to("TargetURL");
from("SourceURL")
  .setHeader("username", constant("Jane Doe"))
  .to("TargetURL");