apache.conf

<VirtualHost *:443>
  # virtual host identification
  ServerName  chat.domain-web.ltd
  ServerAlias chat.domain-web.ltd
  ServerAdmin webmaster@domain-web.ltd

  Protocols h2 http/1.1

  DocumentRoot  /var/www/xmpp-web

  # ssl
  SSLEngine               on
  Header                  always set Strict-Transport-Security "max-age=15768000"
  SSLStrictSNIVHostCheck  on

  # websocket proxy
  <IfModule mod_proxy_wstunnel.c>
    <Location "/xmpp-websocket">
      #ProxyPreserveHost On
      ProxyPass "ws://domain-xmpp.ltd:5280/xmpp-websocket"
    </Location>
  </IfModule>

  # front files
  <Directory "/var/www/xmpp-web/">
    Options -Indexes +FollowSymLinks +MultiViews
    AllowOverride None
    Require all granted
    <IfModule mod_rewrite.c>
      RewriteEngine On
      RewriteBase   /
      RewriteRule   ^index\.html$ - [L]
      RewriteCond   %{REQUEST_FILENAME} !-f
      RewriteCond   %{REQUEST_FILENAME} !-d
      RewriteRule   . /index.html [L]
    </IfModule>
  </Directory>

  # logs
  ErrorLog  ${APACHE_LOG_DIR}/chat_error.log
  LogLevel	warn
  CustomLog ${APACHE_LOG_DIR}/chat_access.log vhost_combined
</VirtualHost>