[SOLVED] Using juce::URL to send POST with body

I found a solution. To anyone wondering in the future, the problem was that the line

url = url.withPOSTData (JSON::toString (juce::var (dyn_obj)));

Would generate the data in json form like so:

{
  "instrument": "piano"
}

However, what was needed in this case apparently is simply

url = url.withPOSTData ("instrument=piano");
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