auth: use 302 redirects in the webserver for ringbuffer reset or resize

[mind04]

Short description

With the current 301 redirect it is only possible to reset or resize once. Every next duplicate action is replaced by the destination cached in the browser.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled and tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master