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from("direct:example").setBody(spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}")).to("mock:result");

In the route above, notice spel is a static method which we need to import from org.apache.camel.language.spel.SpelExpression.spel, as we use spel as an Expression passed in as a parameter to the setBody method. Though if we use the fluent API we can do this instead:

from("direct:example").setBody().spel("Hello #{request.body}! What a beautiful #{request.headers['dayOrNight']}").to("mock:result");

Notice we now use the spel method from the setBody() method. And this does not require us to static import the spel method from org.apache.camel.language.spel.SpelExpression.spel.

And sent a message with the string "World" in the body, and a header "dayOrNight" with value "day":

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