Directory based error page redirection - .htaccess

Question

I have my website with two localised content namely EN and FR and the content will be rendered through the URLs: http://www.example.com/en/ and http://www.example.com/fr/
I want to implement different error pages for each of these locale but do not I do not have an idea on how to implement through the redirect/virtual host configuration.
I read about different .htaccess file for each of the directory but that did not work.
And help will be good. Thanks in advance.

Answer 1

Having different .htaccess works very well, e.g.
/-+- en -- .htaccess
|
+- fr -- .htaccess
And in /en/.htaccess, you have
ErrorDocument 404 /path/to/en/error404.html
and the same with /fr/.htaccess
ErrorDocument 404 /path/to/fr/error404.html
You can also put error documents in the same directory and differentiate by extension, e.g. error404.en.htaml and error404.fr.html. You have then
ErrorDocument 404 /path/to/error404.en.html
and
ErrorDocument 404 /path/to/error404.fr.html
respectively.
If you don't want to use .htaccess files, you can achieve the same with Directory or Location directives. In your main or virtual host configuration, this would look like
<Directory "/path/to/example.com/en">
ErrorDocument 404 /path/to/error404.en.html
</Directory>
<Directory "/path/to/example.com/fr">
ErrorDocument 404 /path/to/error404.fr.html
</Directory>
The <Location> directive looks similar.

Answer 2

On Apache 2.4 you can use expressions:
# for /fr/ URIs
<If "%{REQUEST_URI} =~ m#^/fr/#">
ErrorDocument 404 /fr-404.html
</If>
# for /en/ URIs
<If "%{REQUEST_URI} =~ m#^/en/#">
ErrorDocument 404 /en-404.html
</If>
Check Apache 2.4 expression reference.
If you're still stuck with Apache 2.2 then you can use:
RewriteEngine On
# for /fr/ URIs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^fr/ /fr-404.html [L]
# for /en/ URIs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^en/ /en-404.html [L]
However keep in mind that Apache 2.2 solution will return 200 status to clients.