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From: PerlFAQ Server on 15 May 2010 06:00 This is an excerpt from the latest version perlfaq9.pod, which comes with the standard Perl distribution. These postings aim to reduce the number of repeated questions as well as allow the community to review and update the answers. The latest version of the complete perlfaq is at http://faq.perl.org . -------------------------------------------------------------------- 9.3: How can I get better error messages from a CGI program? Use the "CGI::Carp" module. It replaces "warn" and "die", plus the normal "Carp" modules "carp", "croak", and "confess" functions with more verbose and safer versions. It still sends them to the normal server error log. use CGI::Carp; warn "This is a complaint"; die "But this one is serious"; The following use of "CGI::Carp" also redirects errors to a file of your choice, placed in a "BEGIN" block to catch compile-time warnings as well: BEGIN { use CGI::Carp qw(carpout); open(LOG, ">>/var/local/cgi-logs/mycgi-log") or die "Unable to append to mycgi-log: $!\n"; carpout(*LOG); } You can even arrange for fatal errors to go back to the client browser, which is nice for your own debugging, but might confuse the end user. use CGI::Carp qw(fatalsToBrowser); die "Bad error here"; Even if the error happens before you get the HTTP header out, the module will try to take care of this to avoid the dreaded server 500 errors. Normal warnings still go out to the server error log (or wherever you've sent them with "carpout") with the application name and date stamp prepended. -------------------------------------------------------------------- The perlfaq-workers, a group of volunteers, maintain the perlfaq. They are not necessarily experts in every domain where Perl might show up, so please include as much information as possible and relevant in any corrections. The perlfaq-workers also don't have access to every operating system or platform, so please include relevant details for corrections to examples that do not work on particular platforms. Working code is greatly appreciated. If you'd like to help maintain the perlfaq, see the details in perlfaq.pod.
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