For Apache 2.4.

netdata.conf

<VirtualHost *:80>

	ServerName netdata.irregular-at-tus.work
	ServerAdmin https://qiitadon.com/@yumetodo

	DocumentRoot /usr/share/netdata/web/

	Redirect permanent "/" "https://netdata.irregular-at-tus.work/"

	ErrorLog /home/for_netdata/logs/netdata-error.log
	CustomLog /home/for_netdata/logs/netdata-access.log combined

</VirtualHost>

<VirtualHost *:443>

	ServerName netdata.irregular-at-tus.work
	ServerAdmin https://qiitadon.com/@yumetodo

	DocumentRoot /usr/share/netdata/web/

	SSLEngine On
	SSLCertificateFile    /etc/letsencrypt/live/netdata.irregular-at-tus.work/cert.pem
	SSLCertificateKeyFile /etc/letsencrypt/live/netdata.irregular-at-tus.work/privkey.pem
	SSLProtocol all -SSLv2 -SSLv3
	Header set Strict-Transport-Security "max-age=31536000; includeSubDomains"

	ProxyRequests Off
	ProxyPreserveHost On

	<Proxy *>
		Require all granted
	</Proxy>

	# Local 127.0.0.1:19999 netdata server accessed with '/'
	ProxyPass "/" "http://127.0.0.1:19999/" connectiontimeout=5 timeout=30
	ProxyPassReverse "/" "http://127.0.0.1:19999/"

	<Location />
		AuthType Digest
		AuthName "Digest Auth"
		AuthUserFile /etc/apache2/.htdigest
		Require valid-user
	</Location>

	<FilesMatch "\.(cgi|shtml|phtml|php)$">
		SSLOptions +StdEnvVars
	</FilesMatch>

	<Directory /usr/lib/cgi-bin>
		SSLOptions +StdEnvVars
	</Directory>

	BrowserMatch "MSIE [2-6]" \
	nokeepalive ssl-unclean-shutdown \
	downgrade-1.0 force-response-1.0

	ErrorLog /home/for_netdata/logs/netdata-error.log
	CustomLog /home/for_netdata/logs/netdata-access.log combined

</VirtualHost>