(a simplification of an earlier question - I'm using camel 10.0, spring 3.1)

Can someone tell me how,  *using Spring DSL*, to set the message body to the
size of the message header named "name"?  I don't care if it's simple, or a
different script language (I can't get any to work).  

Something like this -- but this doesn't work:

<camel:setBody>
       
<camel:javaScript>request.headers.get('name').length</camel:javaScript>
</camel:setBody>

I am able to verify the header exists and stream it to standard out just
fine, but trying to get the length throws a variety of exceptions depending
on the method/language I try.

Thanks very much!
-J



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