Question

I’m trying to implement language switching in .htaccess, and the only thing left now is to handle clients which don’t support cookies. To do that, I must set prefer-language when the user clicks a link with a language parameter.

RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} (?:^|&)language=(en|fr|no)
RewriteRule ^(.*)$ $1? [cookie=language:%1:.example.com,env=language:%1,R]

SetEnv prefer-language $language

The problem is with the last line – The value is always set to empty. It works if I hardcode it, but not if I try to refer to a variable. Is there some special syntax to refer to environment variables in this context, or is there some other way to set prefer-language?

Edit: Cross-posted to Apache users list.

Answer 1

You can set environment variables with mod_rewrite as well. Actually, you already did that (see env/E flag).

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I can’t test it with mod_negotiation myself, but the following should work and set the prefer-language:

RewriteCond %{QUERY_STRING} ^((?:[^&]&)*)language=(en|fr|no)&?([^&].*)?$
RewriteRule ^ %{REQUEST_URI}?%1%3 [L,CO=language:%2,R]
RewriteCond %{HTTP_COOKIE} (^|[,\s])language=([^\s,;]+)
RewriteRule ^ - [L,E=prefer-language:%2]
SetEnvIf REDIRECT_prefer-language (.+) prefer-language=$1

But it would be far easier if you put the language identifier into the URL path like /en/…:

SetEnvIf Request_URI ^/(en|fr|no)/ prefer-language=$1
SetEnvIf REDIRECT_prefer-language (.+) prefer-language=$1

I don’t know if you need the additional/second SetEnvIf variable.