rubygem-http_accept_language

Rails plugin to extract Accept-Language HTTP header into array

HttpAcceptLanguage is a gem, which helps you detect the users preferred language, as sent by the "Accept-Language" HTTP header. The algorithm is based on RFC 2616, with one exception: when a user requests "en-US" and "en" is an available language, "en" is deemed compatible with "en-US". The RFC specifies that the requested language must either exactly match the available language or must exactly match a prefix of the available language. This means that when the user requests "en" and "en-US" is available, "en-US" would be compatible, but not the other way around. This is usually not what you're looking for.