Thank you for contacting Aspose Support.
This issue only happens when we call it from an Azure hosted application.
Am I right in my assumption that you are calling Apose Cloud API from Azure hosted application. You are not using Azure as third-party storage. In other words, you are trying to upload a file to Aspose Cloud Storage not on Azure Storage.
Can you please confirm if it is intended to be able to call the Aspose Cloud Web Service from the Azure Cloud and if there is any specific setup which is needed to make it work?
Yes, it should work and you are not supposed to do any specific setup.
We also offer OAuth 2.0 authentication along with URL Signing. The cURL example to upload file to Aspose Cloud Storage using OAuth authentication would look as follows:
// First get Access Token
// Get App Key and App SID from https://dashboard.aspose.cloud/
curl -v "https://api.aspose.cloud/oauth2/token" \
-X POST \
-d 'grant_type=client_credentials&client_id=0B17F60A-6D69-426B-9ABD-79F35A6E9F7B&client_secret=53b8b19adffa41a3e87dbbd8858977ae' \
-H "Content-Type: application/x-www-form-urlencoded" \
-H "Accept: application/json"
// Upload File to Aspose Cloud Storage
curl -v "https://api.aspose.cloud/v1.1/storage/file?path=testfile.txt" \
-X PUT \
-T testfile.txt \
-H "Content-Type: multipart/form-data" \
-H "Accept: application/json" \
-H "Authorization: Bearer x1gyQElrKoW-N27FXiuBUhJO0KcUr50ZUcm6NQrAwR2aI5EDXtdABOjuWUp_bHRV-OUBE1hFNsnMm_KiTRRFFpdLh7YzJqLFTkMlJfioA8N81bQmT5kUg936W1tpe0H1cDccBeV08UIvvsT6mqewZ3DiG9OrEDRgb3fx31OuRY8oyVv62vQI1JKSJAGEl0Qy6Dnr_DsR5rdVUeCy8En6gBMd_gj2KgJFAr6awG3S4ufQHTgGVadt-wpBQ4aPwImLASSWfPTv7JonlVT0_-I69zjVHqmO8moAEDsDMvdY39eM1Se_fQMBIve0-gWYrHrikThMo7r4jtY_h9JCXQBr1H1NtHwEPIVXvh7NREAxzALMFsl7y_4OWw1vMRI0O3oYNXVjvwkwhR6_rUr4nYl-xEaFeciKknk8YifKqkpksPlZWUiN"
I hope this helps.