Ubuntu16.04 で Apache2 を使って localhost を立てる ref: https://qiita.com/sudokzt/items/6100288a82eb2b2685e3

file0.txt

<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin webmaster@localhost
 #ここの下のDocumentRootを変更します#########################
        DocumentRoot /home/username/mypage

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf

 #ここに下の３行を追加します##########################
        <Directory /home/username/mypage>
            Require all granted
        </Directory>

</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

file1.txt

#Apache2.2系のアクセス許可設定
<Directory "/home/sandbox/htdocs">
    Order allow,deny
    Allow from all
</Directory>

file2.txt

#Apache2.4系のアクセス許可設定
<Directory "/home/sandbox/htdocs">
    Require all granted
</Directory>

file3.txt

</VirtualHost>