Install libplack-middleware-logerrors-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libplack-middleware-logerrors-perl
map psgi.errors to psgix.logger or other logger
psgi.errors defaults to stderr in most backends, which results in content going somewhere unhelpful like the server console. . Plack::Middleware::LogErrors simply remaps the psgi.errors stream to the psgix.logger stream, or an explicit logger that you provide. . This is especially handy when used in combination with other middlewares such as Plack::Middleware::LogWarn (which diverts Perl warnings to psgi.errors); Plack::Middleware::HTTPExceptions (which diverts uncaught exceptions to psgi.errors); and Plack::Middleware::AccessLog, which defaults to psgi.errors when not passed a logger -- which is also automatically applied via plackup (so if you provided no --access-log option indicating a filename, psgi.errors is used). . Plack is a set of tools similar to Ruby's Rack or Python's Paste for WSGI. It implements the Perl Server Gateway Interface (PSGI) standard interface, which allows developers to decouple their web application framework from the local web server environment.