UnicornLoadBalancer.conf

<VirtualHost *:80>
   ServerName myplex.com
   Redirect permanent / https://myplex.com
</VirtualHost>

<VirtualHost *:443>
  ServerName myplex.com

  # Logs
  ErrorLog /var/log/httpd/myplex.com-error_log
  CustomLog /var/log/httpd/myplex.com-access_log common

  # SSL
  SSLEngine On
  SSLCertificateFile "/etc/letsencrypt/live/myplex.com/fullchain.pem"
  SSLCertificateKeyFile "/etc/letsencrypt/live/myplex.com/privkey.pem"
  SSLProtocol +TLSv1.2
  ProtocolsHonorOrder On
  Protocols h2 http/1.1

############### Possible fixes if you have issues ##############
#  SSLProxyVerify none
#  SSLProxyCheckPeerCN Off
#  SSLProxyCheckPeerName Off
#  SSLStrictSNIVHostCheck On
################################################################

  Options -Includes -ExecCGI
  RewriteEngine On
  LimitRequestBody 512000

  Header always set Strict-Transport-Security "max-age=63072000; includeSubdomains; preload"
  Header always set X-Frame-Options DENY
  FileETag None
  TraceEnable off
  Header edit Set-Cookie ^(.*)$ ;HttpOnly;Secure
  Header set X-XSS-Protection "1; mode=block"
  Timeout 60

  <Location /:/websockets/notifications>
    ProxyPass wss://<LoadBalancerIP>:<LoadBalancerPort>/:/websockets/notifications
    ProxyPassReverse wss://<LoadBalancerIP>:<LoadBalancerPort>/:/websockets/notifications

    ProxyPass ws://<LoadBalancerIP>:<LoadBalancerPort>/:/websockets/notifications
    ProxyPassReverse ws://<LoadBalancerIP>:<LoadBalancerPort>/:/websockets/notifications
  </Location>

  # Proxy configuration
  <Proxy "*">
    Require all granted
  </Proxy>

  ProxyRequests Off
  ProxyPreserveHost On
  SSLProxyEngine on

  SSLProxyProtocol -ALL +TLSv1.2

  ProxyPass / http://<LoadBalancerIP>:<LoadBalancerPort>/
  ProxyPassReverse / http://<LoadBalancerIP>:<LoadBalancerPort>/

  RewriteCond %{REQUEST_URI} !^/web
  # plex web uses query strings, not headers
  RewriteCond %{QUERY_STRING} !(.*(?:^|&))X-Plex-Device=(.*)((?:&|$).*)
  RewriteCond %{HTTP:X-Plex-Device} ^$
  RewriteCond %{REQUEST_METHOD} !^(OPTIONS)$
  RewriteRule ^/$ /web/$1? [R,L]
</VirtualHost>