Missing parameter(s): items (rest_missing_callback_param)

Edit: the items parameter is there https://prntscr.com/m50uyi. Looks like an encoding issue somewhere

This is not something I’m able to reproduce. Based on your screenshot it seems to be occurring on a local server. Is it possible something is changing the REST API in some way?

No I thought so too. I first got the issue on an amazon server and had the same issue. So I created a local installation with nothing other than the redirection plugin and my code that changes the API URL…

If you remove the code does the plugin work?

Yes here is the code that creates the issue: https://prntscr.com/m670s4