redirect_canonical suddenly causes issues with paramter values and CDN

[retrovertigo]

Hi there,

I was just wondering if anything has changed regarding ​https://developer.wordpress.org/reference/functions/redirect_canonical/?

https://some-domain.tld/?my_param=a+a

triggers a 301 redirect to
https://some-domain.tld/?my_param=a a

Now our CDN is set to pass URLs with my_param straight on to WordPress. Since that response with a 301, that's what gets cached by the CDN and causes a redirect loop.

Is that something new? I hadn't had that issue before, but also not 100% sure if I sent a value like "a+a" before. Trying to figure out why this redirect loop happens now after years.

I'll leave that ticket to be a bug, but if nothing has changed in redirect_canonical() then I guess it can just be closed.

Thanks for your help.