• I looked at that Xively sample (that's how I discovered the headers field, it's not documented in the reference - maybe it should be added?).

    It's an OData backend, my guess is that they enforce it somehow, either OData standard, or the .NET implementation of it.

    I have a working workflow now, so all is good :)

    EDIT: Because I realized I could add the simple ",headers" to the doc string myself I did and made a PR for it here.

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