.htaccess

<Files ~ "^\.(htaccess|htpasswd)$">
deny from all
</Files>
Options -Indexes
AuthUserFile /var/www/html/.htpasswd
# AuthGroupFile /dev/null
AuthName "Please enter your ID and password"
AuthType Basic
require valid-user
order deny,allow

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wp/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wp/index.php [L]
</IfModule>
# END WordPress

# Next.js (SSG)
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

RewriteRule ^news/$ /news.html [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^news/.+$ /news/[slug].html [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^archive/.+$ /archive/[year].html [L]
</IfModule>

SetEnvIf Referer "^https://usagizmo\.com" ref01
order deny,allow
deny from all
allow from env=ref01

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

RewriteRule ^jp/company/links.html$ https://%{HTTP_HOST}/ja/company/agency/ [L,R=301]
RewriteRule ^jp/company/QualityPolicy.html$ https://%{HTTP_HOST}/ja/company/qualitypolicy/ [L,R=301]
RewriteRule ^jp/product/$ https://%{HTTP_HOST}/ja/product/brand/ [L,R=301]
RewriteRule ^jp/product/new.html$ https://%{HTTP_HOST}/ja/product/ [L,R=301]

RewriteRule ^jp(.*?).html$ https://%{HTTP_HOST}/ja$1/ [L,R=301]
RewriteRule ^jp(.*?)$ https://%{HTTP_HOST}/ja$1 [L,R=301]
</IfModule>

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/en/inquiry/.*$
RewriteCond %{REQUEST_URI} !^/cn/inquiry/.*$
RewriteRule ^en/(.*?)$ http://%{HTTP_HOST}/en/$1 [L,R=302]
RewriteRule ^zh/(.*?)$ http://%{HTTP_HOST}/cn/$1 [L,R=302]
</IfModule>

# maintenance
ErrorDocument 503 /maintenance.html
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /

  #ip is not your ip. Change ip to see maintenance page
  # RewriteCond %{HTTP:X-Forwarded-For} !^133\.232\.121\.214$
  RewriteCond %{REMOTE_ADDR} !^111\.222\.333\.444$

  #requests made not to maintenance.html
  RewriteCond %{REQUEST_URI} !\.(jpe?g?|png|gif|js|css) [NC]
  # RewriteCond %{REQUEST_URI} !^/maintenance\.html$ [NC]
  RewriteCond %{REQUEST_URI} !^/maintenance\.html$

  #rewrite to maintenance.html
  RewriteRule ^(.*)$ /maintenance.html [L]
</IfModule>

Ignore_authentication_in_specific_directory

Satisfy any
order allow,deny
allow from all

set_htpasswd.sh

apt-get install apache2-utils
htpasswd -c /var/www/html/.htpasswd USER_NAME