How can I set a new Camel header value using the value of an existing header?

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Issue

How can I set a new header value using the value of an existing header?

Is it possible to copy a header value into a new header?

How can I save an existing header value in case a processor changes it?

Environment

Apache Camel 1.x - 2.x
Fuse Mediation Router 2.x

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