The following objects are supported by PowerServer to exchange data in JSON and consume the RESTful web services (however, any functions/events/properties which are newly added to these objects in PowerBuilder 2019 are still not supported by PowerServer):
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HTTPClient object: supported by both PowerServer Web and PowerServer Mobile (HTTPClient does not support SSL 2.0 for PowerServer Mobile)
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JSONGenerator object: supported by PowerServer Web only
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JSONParser object: supported by PowerServer Web only
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RESTClient object: supported by PowerServer Web only (RESTClient does not support DataWindowChild and OAuth 2.0)