in reply to Altering data in STDIN

because Apache's Basic Authorization's data is not passed to CGI application.

You need to read more about CGI.

CGI Environment variables

rfc3875 4.1.11. REMOTE_USER

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Re^2: Altering data in STDIN
by ionsphere (Initiate) on Sep 02, 2008 at 08:52 UTC
    Thank you for reply! I have not noticed that. And it could have been a good way to go if only
    P.S. All that would have been easier if only I could change the CGI application, but I can't.

    And it has a handler on
    $q=new CGI;$q->param('user');

    Still if nothing else is possible, I guess the application should be changed, and that is an other headache and not for me.