Re: ENV variable

$ENV{HTTP_USER_AGENT} is only set by your webserver when it runs your script (as a CGI script). It is not set in your shell, because there is no browser connected to your shell session. How did you check the contents of %ENV, and in what environment?

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Re^2: ENV variable by irah (Pilgrim) on Feb 02, 2009 at 08:01 UTC
My program follows, sub is_firefox { my $agent = ''; $agent = $ENV{"HTTP_USER_AGENT"} \|\| ''; if (length($agent) && $agent =~ m/firefox/si) { return 1; } return 0; } I have printed all the keys and values of %ENV using while and each. I have checked this in Debian Linux, and Apache server.	[reply]
Re^3: ENV variable by Corion (Patriarch) on Feb 02, 2009 at 08:04 UTC
It's quite possible that your browser does not send its user agent. Also, what code you've shown is not a complete program, hence I cannot tell whether there is some other error. You should consider starting using CGI or CGI::Mini, which have the `->user_agent()` method, which caters for other ways of passing the user agent around. For example, mod_perl likely doesn't set `$ENV{HTTP_USER_AGENT}`, because `%ENV` is process global and mod_perl can run in system threads.	[reply] [d/l] [select]