晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/perl5/vendor_perl/LWP/Debug.pm
package LWP::Debug;    # legacy

our $VERSION = '6.34';

require Exporter;
our @ISA       = qw(Exporter);
our @EXPORT_OK = qw(level trace debug conns);

use Carp ();

my @levels = qw(trace debug conns);
our %current_level = ();

sub import {
    my $pack    = shift;
    my $callpkg = caller(0);
    my @symbols = ();
    my @levels  = ();
    for (@_) {
        if (/^[-+]/) {
            push(@levels, $_);
        }
        else {
            push(@symbols, $_);
        }
    }
    Exporter::export($pack, $callpkg, @symbols);
    level(@levels);
}

sub level {
    for (@_) {
        if ($_ eq '+') {    # all on
                            # switch on all levels
            %current_level = map { $_ => 1 } @levels;
        }
        elsif ($_ eq '-') {    # all off
            %current_level = ();
        }
        elsif (/^([-+])(\w+)$/) {
            $current_level{$2} = $1 eq '+';
        }
        else {
            Carp::croak("Illegal level format $_");
        }
    }
}

sub trace { _log(@_) if $current_level{'trace'}; }
sub debug { _log(@_) if $current_level{'debug'}; }
sub conns { _log(@_) if $current_level{'conns'}; }

sub _log {
    my $msg = shift;
    $msg .= "\n" unless $msg =~ /\n$/;    # ensure trailing "\n"

    my ($package, $filename, $line, $sub) = caller(2);
    print STDERR "$sub: $msg";
}

1;

__END__

=pod

=head1 NAME

LWP::Debug - deprecated

=head1 DESCRIPTION

This module has been deprecated.  Please see L<LWP::ConsoleLogger> for your
debugging needs.

LWP::Debug is used to provide tracing facilities, but these are not used
by LWP any more.  The code in this module is kept around
(undocumented) so that 3rd party code that happens to use the old
interfaces continue to run.

One useful feature that LWP::Debug provided (in an imprecise and
troublesome way) was network traffic monitoring.  The following
section provides some hints about recommended replacements.

=head2 Network traffic monitoring

The best way to monitor the network traffic that LWP generates is to
use an external TCP monitoring program.  The
L<WireShark|http://www.wireshark.org/> program is highly recommended for this.

Another approach it to use a debugging HTTP proxy server and make
LWP direct all its traffic via this one.  Call C<< $ua->proxy >> to
set it up and then just use LWP as before.

For less precise monitoring needs just setting up a few simple
handlers might do.  The following example sets up handlers to dump the
request and response objects that pass through LWP:

  use LWP::UserAgent;
  $ua = LWP::UserAgent->new;
  $ua->default_header('Accept-Encoding' => scalar HTTP::Message::decodable());

  $ua->add_handler("request_send",  sub { shift->dump; return });
  $ua->add_handler("response_done", sub { shift->dump; return });

  $ua->get("http://www.example.com");

=head1 SEE ALSO

L<LWP::ConsoleLogger>, L<LWP::ConsoleLogger::Everywhere>, L<LWP::UserAgent>

=cut

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