Redirect http to https without checking HTTPS != on

.htaccess

# ----------------------------------------------------------------------
# | Forcing `https://`                                                 |
# ----------------------------------------------------------------------

# Redirect from the `http://` to the `https://` version of the URL.
# On my Server the %{HTTPS} !=on does not work and always redirects 
# (infinite redirect loop with the "Too many redirects"-error)

<IfModule mod_rewrite.c>
   RewriteEngine On
   # does not work on my mittwald-server
   #RewriteCond %{HTTPS} !=on
   # use this check instead
   RewriteCond %{SERVER_PORT} ^80$
   RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]
</IfModule>


# in some environments it is necessary to use this:
   # for the normal environment as fallback (e.g. DEV)
   RewriteCond %{HTTPS} off
   # some special kind of sorcery...
   RewriteCond %{HTTP:X-Forwarded-Proto} !https
   RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]