The library library(http/http_error) defines a hook that
decorates uncaught exceptions with a stack-trace. This will generate a 500
internal server error document with a stack-trace. To enable this
feature, simply load this library. Please do note that providing error
information to the user simplifies the job of a hacker trying to
compromise your server. It is therefore not recommended to load this
file by default.
The example program calc.pl has the error handler loaded
which can be triggered by forcing a divide-by-zero in the calculator.