Apache mod_rewrite reverse proxy with SSL bound to two ports, proxying to two separate backends

ssl.conf

<VirtualHost _default_:443 _default_:8443>
  
  # Force %{SERVER_PORT} to contain the actual local port of the connection
  UseCanonicalPhysicalPort On

  RewriteEngine On

  # Reverse Proxy to localhost:80 if connection was to port 443
  RewriteCond %{SERVER_PORT} =443
  RewriteRule (.*) http://localhost$1 [P]

  # Reverse Proxy to localhost:8080 if connection was to port 8443
  RewriteCond %{SERVER_PORT} =8443
  RewriteRule (.*) http://localhost:8080$1 [P]

  SSLEngine On
  SSLCertificateFile /etc/httpd/ssl/foo.crt
  SSLCertificateKeyFile /etc/httpd/ssl/foo.key

</VirtualHost>