Custom error page for non-existent files: how to do it?

Question

Nginx

Colleagues, good day to all! I ran into this question:
in the folder with the wordpress theme there is a script for handling requests to non-existent pages - 404.php . On the site I'm working with, there is just a redirect to the main one:

<script>
location.href='http://example.com'; 
</script>

But this only works if we request a non-existent page, like example.com/nonexistent
But how to make it show not the standard nginx '404 Not Found' message, but some special page when requesting a non-existent file ? Those. when requesting example.com/wrongimage.jpg, example.com/wrongdocument.pdf Please tell me in which direction to dig, because I'm not even sure that the problem is solved completely inside WordPress. Thanks in advance!

Answer 1

server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;
        . . .
        error_page 404 /404.php;
        location = /404.php {
                root /usr/share/nginx/html;
                internal;
        }
}