From within a REST Message workflow activity, I've been attempting to use variable substitution to set the value of a header on a REST message. This worked fine from a Run Script activity, using the RESTMessage object and the setStringParameter function. I realize using setStringParameter isn't exactly the same as using the ${...} format, but the basic principal is the same. Then I ran across this in the wiki, on the REST Message page: "Headers cannot be set in the REST message workflow activity."
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