I am using Kendo 2020.2.513 and I want to do something as in this Dojo: https://dojo.telerik.com/EnuyodAQ
In fact, I am perfectly able to reproduce that code in my project. However, as soon as I change the URL with the one that is providing my data, the code is failing. Data is binded correctly to the spreadsheet, but the next error occurs:
I have even updated the server code to return provide a Jsonp output (so far, it was normal Json). When accessing the data URL directly, with a callback query parameter, the output is consistent with the one in the Dojo example (https://demos.telerik.com/kendo-ui/service/Products?callback=someCallbackFn&_=1234).
The only difference I can come up with is that, since I am testing locally, my server is serving the content without SSL/TLS (no HTTPS). But I don't think that is relevant at this point.
Do you have any idea of what can be going on?