How do you run the REST operation? Via scripting code, or using the workflow 'Invoke a REST operation'? If via workflow, you may need to extend id (to add additional headers via code, the same way as the workflow adds the headers mandatory for the REST operation). Or you can modify the REST operation by calling its setManadatoryHeaderParameter() method; this change can be done in the same place where you create the operation, or in other places in your workflow where you have access to operation object.
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