Redirect based on set cookie - .htaccess

Question

I have a bilingual website.
The user should be automatically redirected to the appropriate subdirectory /en/ and /de/ based on his browser language. I achieve that via .htaccess.
On the website is a language switcher if the user nevertheless wants to switch the language. When the language is switched, there’s a cookie set which contains either the value en or de.
Now I’d like my htaccess to check if there’s a cookie set and if yes: Check the value and redirect to the appropriate folder. If not: Check the browser language and redirect to the appropriate folder.
This is what I have so far but it gives me an error: Too many redirects …
RewriteEngine on
RewriteCond %{HTTP_COOKIE} Test=en; [NC]
RewriteRule ^ http://example.com/en [L,R=301]
RewriteCond %{HTTP_COOKIE} Test=de; [NC]
RewriteRule ^ http://example.com/de [L,R=301]
RewriteCond %{HTTP:Accept-Language} ^de [NC]
RewriteRule ^$ http://example.com/de [L,R=301]
RewriteRule ^$ http://example.com/en [L,R=301]
This is the code that generates the cookie:
if (session_id() == '') {
session_start();
}
$lang = basename ( $_SERVER['REQUEST_URI'] );
setcookie("Test", $lang);

Answer 1

You're not restricting the redirection when the URL has already been redirected once. This is causing the infinite redirection loop.
RewriteCond %{REQUEST_URI} !^/(?:en|de) [NC]
RewriteCond %{HTTP_COOKIE} test=(en|de) [NC]
RewriteRule ^(.*)$ http://example.com/%1/$1 [R=301,L]
RewriteCond %{HTTP:Accept-Language} ^de [NC]
RewriteRule ^$ http://example.com/de [R=301,L]
RewriteRule ^$ http://example.com/en [R=301,L]