Force Language Path Prefix For Default Language I have a multilingual site configured to use path prefix for URL language detection.

When no prefix is used in the URL, the default language is assumed. How can I change this behavior? 

I want the site to return content only when a language prefix is set in the URL, otherwise return a "page not found" error.

Reasoning behind this functionality:


Preventing duplicate content in search engines
Keeping everything well organized (under language prefixes)
Avoiding users to be able to view content without a language prefix and thus potentially link to it (loosing link juice)


Edit: added reasoning.
You can configure it from (admin/config/regional/language/edit/en) if English language is the default and change (‏Path prefix language code) field from empty to en for example