We have been working to store images in cloudkit using the asset uploading feature. We are running our web servers using the .NET framework. I have managed to do the initial request using the: POST [path]/database/[version]/[container]/[environment]/[database]/assets/upload endpoint specified here: https://developer.apple.com/library/content/documentation/DataManagement/Conceptual/CloudKitWebServicesReference/UploadAssets.html.
I have recieved the response with the url to which I should upload the asset information. Upon making this request to p44-contentws.icloud.com (the issue seems to be rooted in using the 'p44-contentws' part of the url). The response I get is along the lines of "The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.".
I had initially thought the issue was to do with a firewall problem which has been verified to not be the case. We have also got this working in a postman request and recieved the appropriate response. So the question remains, is .NET supported by the cloudkit asset upload process? Has anybody else got a working example of this request? Is this a known issue?
