Error 400 and 404 with a Russian link. How to eliminate?

Question

Web servers

Link in Russian. The letter K is equal to %D0%BA.

If I specify in these two ways, everything is processed
200 Everything is OK:
example.ru/to
example.ru/%D0%BA

If I delete several characters from the encoded link, then
Error 1:
400
Bad Request
Your browser sent a request that this server could not understand.
example.ru/%D0%B
example.ru/%D0%

If I remove half of the encoded letter, then
Error 2:
404
example.ru/%D0

example.ru/4/%D0 - this request must be processed by the application with a redirect. But the redirect does not occur and 404 is displayed

. How to implement the processing of these errors?
The application is written in laravel.