Hello @catalpha,
About the 400 error:
https://kinsta.com/knowledgebase/400-bad-request/
This is not even processed by the plugin on the server-side. It means, your hosting service, or server, is blocking it. What is the reason? Only they know, unfortunately. Can you ask them?
Have you seen this error before? Is there an indication of a particular reason for the error that other users have experienced? Maybe this can give me a place to start troubleshooting.
Thank you.
It’s very hard to say, as it could be anything. But maybe your server starts blocking requests which are coming too fast, or too often. However, in your case, it happens right away… so I am not really sure.
What is your hosting service? Are you using your own server, in fact?
