How to block url with repeated slashes at the beginning in nginx?

Question

Nginx

Good afternoon!
The question is probably simple, but I can't find the answer. Help me please!
How to block requests of the form in nginx:
//
//index.php
///index.php
///something there
I don’t understand how this goes, apparently some kind of bot. It's impossible to repeat this in browsers...
There is DOS from Asia to a server from the Netherlands. Nothing serious, but interferes with work ...
Thanks in advance!

Answer 1

server {
    if ($request_uri ~ "^//") {
        return 444;
    }