A script runs via localhost but not via 127.0.0.1

Question

I am trying to migrate some software from apache 2.2 to 2.4. I have it working - almost. When accessing the server via address localhost things work, but when trying to access via 127.0.0.1 some things don't.

For example, http://localhost/cgi-bin/WI_facility shows me the correct page, but http://127.0.0.1/cgi-bin/WI_facility asks me do I want to save the file WI_facility which is BIN file (164KB).

Key part of the apache2.conf is below:

<VirtualHost *:80>
    DocumentRoot /var/www/html
    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>
    <Directory /var/www/html>
        Options -Indexes +FollowSymLinks +MultiViews
        AllowOverride All
        Require local
    </Directory>

    ScriptAlias /cgi-bin/ /var/www/cgi-bin/
    <Directory /var/www/cgi-bin>
        AllowOverride All
        Options +ExecCGI
        SetHandler cgi-script
        Require local
    </Directory>
</VirtualHost>

Edit: I forgot to mention this is on Ubuntu 16.04.