if command seems not working? what is wrong with me?

[bvidinli]

i have following config:


                      if ($http_user_agent ~* Opera ) {
                                return 444;
                        }



but, even if I try to access pages using Opera, Opera can open pages.
What is wrong with my config ?

(for Operat lovers: normally I do not want to block opera, just
testing something )

Thanks.