Hey @luceos thanks for reply. While filtering by "Doc" I see only "Request Headers" and nothing about response. But when filtering by "Other" I see a lot of entries with status 301, "Response Headers" are like this:
HTTP/1.1 301 Moved Permanently
Date: Sun, 24 Mar 2019 20:28:24 GMT
Server: Apache/2.4.38
Location: https://atom.lt/index.php
Content-Length: 233
Keep-Alive: timeout=5, max=74
Connection: Keep-Alive
Content-Type: text/html; charset=iso-8859-1
Can it be related to .htaccess? Maybe I need to edit something there?
EDIT: In config.php I have correct line with url:
'url' => 'https://atom.lt/index.php'
EDIT2: Another thing I just now noticed is this:
Resource interpreted as Document but transferred with MIME type application/x-httpd-php
So I think you are correct with your guess about misconfigured Apache. Any ideas where to search for a problem? Apache got installed and autoconfigured by Virtualmin administration panel.