404 Not Found - how to replace with your page?

Question

linux

Greetings.
When I open the link domen.ru/str, I get this:

The file/directory str does not really exist.
How to replace the output on the screen with your own page?
On board ISPmanager 5 and Debian 7.6.

Answer 1

Custom 404 without HTTP/1.1 301 Moved Permanently
Sorry, found it. It is strange that when choosing a topic, this question did not appear in the results)

Answer 2

It is possible through the .htaccess file
ErrorDocument 404 /error/404_error.html