Has something happened with AJAX in a web browser or a recent Photon update that has broken AJAX XMLHttpRequest() commands. I have been using an .ino and .html pair for several years that has worked very consistently, and worked in April 2019, but presently does not seem to work.
I think it might be a CORS issue or a photon update but really not sure.
I will try to post a simple version of my issue. The problem seems to be when sending the form parameters. Curl commands work, sending curl commands in a node program works, just from the website seems to be an issue.