rune on 13 Jun, 2017 12:52 AM
Where is the service you're trying to upload to hosted? I can't think of a likely reason why the upload would fail due to the application being hosted on AppHarbor, but if the receiving web service is hosted on AppHarbor that could explain the difference. In particular, the load balancer for apps hosted on AppHarbor is configured to only accept uploads of up to 10MB (e.g. when uploading from a browser or a separate client).