trace   : trace function calls
  debug   : print debug messages
  conns   : show all data transfered over the connections

The LWP::Debug module provide a special import() method that allows
you to pass the level() arguments with initial use statement.  If a
use argument start with '+' or '-' then it is passed to the level
function, else the name is exported as usual.  The following two
statements are thus equivalent (if you ignore that the second pollutes
your namespace):

  use LWP::Debug qw(+);
  use LWP::Debug qw(level); level('+');

=item trace($msg)

The C<trace()> function is used for tracing function
calls. The package and calling subroutine name is
printed along with the passed argument. This should
be called at the start of every major function.

=item debug($msg)

The C<debug()> function is used for high-granularity
reporting of state in functions.

=item conns($msg)

The C<conns()> function is used to show data being
transferred over the connections. This may generate
considerable output.

=back