lennaert: Thank you for all your support so far.
Debugging in Chrome shows me the error:
[quote:1a7je1xd]XMLHttpRequest cannot load https://php.radford.edu/~jcdavis/D2L/cl ... 23&scale=C. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.byondisoft.com' is therefore not allowed access.
Even if I send the header as "Access-Control-Allow-Origin: *" as in the documentation, the error is displayed.
And then I receive this warning:
[quote:1a7je1xd]Uncaught (in promise) DOMException: Only secure origins are allowed (see: https://goo.gl/Y0ZkNV).
It's either something fundamental that I need to learn about web services and browser security overall or Chrome is being more restrictive than others. Strange thing is that web service is to be tested publicly.
Maybe it's the HTTPS protocol that it uses?
Thanks a lot!