Change HTTP response status code 200 – 206

First: With Apache you cannot have HTTPS and HTTP running on the same port.

See: Apache answer both HTTP and HTTPS on the same port

For handling both SSL and non-SSL traffic you have to define two virtual hosts.

See: Redirect http to https apache on different port

For the redirect from non-SSL virtual host to SSL virtual host we use this:

<VirtualHost *:80>
        RewriteEngine on
        RewriteCond  %{HTTPS} !=on
        RewriteCond  %{HTTP_HOST} ^(.*)$
        RewriteRule  ^(.*)/? https://%1$1 [L,R]
</VirtualHost>

Remains the problem that explicitly sending a non-SSL request to the SSL-enabled port ( http://mydomain.com:443/ ) gives the:

You're speaking plain HTTP to an SSL-enabled server port

page as plain text (in a Firefox browser). Explicitly sending a SSL request to the non-SSL port ( https://mydomain.com:80/ ) gives a:

ssl_error_rx_record_too_long error

(in the Firefox browser).

Why is this occurring?

There's shouldn't be an [R] after the RewriteRule as this tells Apache to send a 302 redirect rather than internally rewriting the URL.

The second part of the RewriteRule should start with a slash unless this is in a Directory context (such as in a .htaccess file or a <Directory > block). Without the slash, you are rewriting the URL to something like http://example.comnl/index.php rather than http://example.com/nl/index.php.

RewriteEngine On
RewriteCond %{REQUEST_URI} !^/en.*
RewriteCond %{REQUEST_URI} !^/nl.*
RewriteRule ^(.*)$  /nl$1 [L]