apache authentication filter run twice

as a slight protection for the staging beta phase, I am using a filter in my application_controller

before_filter :authenticate_apache ...   def authenticate_apache     if Rails.env == "production"       authenticate_or_request_with_http_basic do |user, pass|         ["user1", "user2", "user"].include?(user) && pass=="staging_password"       end     end   end

.. going to the root page, the authentication is requested as it should be.. once authenticated the user is on the home page => www.mydomain.com

then when the user request another page by clicking on the menu, the authentication is requested another time => www.mydomain.com/pages/area1 then for any subsequent page request, the authentication is not anymore requested

any idea why this is running twice ? thanks fro any clue

#FIRST REQUEST Started GET "/" for 2.12.109.167 at 2012-06-16 13:27:01 +0100 Processing by PagesController#home as HTML Filter chain halted as :authenticate_apache rendered or redirected Completed 401 Unauthorized in 1ms (ActiveRecord: 0.0ms)

Started GET "/" for 2.12.109.167 at 2012-06-16 13:27:20 +0100 Processing by PagesController#home as HTML   Rendered pages/home/_slides.html.haml (1.6ms) ... Completed 200 OK in 87ms (Views: 85.3ms | ActiveRecord: 0.6ms)

# SECOND REQUEST Started GET "/pages/tourisme" for 2.12.109.167 at 2012-06-16 13:27:38 +0100 Processing by PagesController#tourism as HTML Filter chain halted as :authenticate_apache rendered or redirected Completed 401 Unauthorized in 1ms (ActiveRecord: 0.0ms)

Started GET "/pages/tourism" for 2.12.109.167 at 2012-06-16 13:27:44 +0100 Processing by PagesController#tourisme as HTML   Rendered layouts/shared/_player.js.erb (0.3ms)   ... Completed 200 OK in 15ms (Views: 13.9ms | ActiveRecord: 0.6ms)

# SUBSEQUENT REQUESTS Started GET "/pages/real_estate" for 2.12.109.167 at 2012-06-16 13:27:57 +0100 Processing by PagesController#immobilier as HTML   Rendered layouts/shared/_player.js.erb (0.3ms) ... Completed 200 OK in 15ms (Views: 13.0ms | ActiveRecord: 0.9ms)