A lot depends on the error -- an application level error (bad user input, unavailable resource, etc) I usually handle with my own exception handling routines. Fatal exceptions I usually dump into the web server using somehting like CGI::Carp. It also lets you print error messages to the browser screen, but this shouldn't be done for a production, just as a debugging tool.
Go not to the Elves for counsel, for they will say both no and yes
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