When you make an update call like that, there is no body in the response. The HTTP "200 OK" status is all you need. So I suspect output.json is empty, which is why your json parser is rejecting it.
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When you make an update call like that, there is no body in the response. The HTTP "200 OK" status is all you need. So I suspect output.json is empty, which is why your json parser is rejecting it.