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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Directory :  /usr/share/perl5/vendor_perl/LWP/Authen/

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Current File : //usr/share/perl5/vendor_perl/LWP/Authen/Basic.pm
package LWP::Authen::Basic;

use strict;

our $VERSION = '6.34';

require MIME::Base64;

sub auth_header {
    my($class, $user, $pass) = @_;
    return "Basic " . MIME::Base64::encode("$user:$pass", "");
}

sub authenticate
{
    my($class, $ua, $proxy, $auth_param, $response,
       $request, $arg, $size) = @_;

    my $realm = $auth_param->{realm} || "";
    my $url = $proxy ? $request->{proxy} : $request->uri_canonical;
    return $response unless $url;
    my $host_port = $url->host_port;
    my $auth_header = $proxy ? "Proxy-Authorization" : "Authorization";

    my @m = $proxy ? (m_proxy => $url) : (m_host_port => $host_port);
    push(@m, realm => $realm);

    my $h = $ua->get_my_handler("request_prepare", @m, sub {
        $_[0]{callback} = sub {
            my($req, $ua, $h) = @_;
            my($user, $pass) = $ua->credentials($host_port, $h->{realm});
	    if (defined $user) {
		my $auth_value = $class->auth_header($user, $pass, $req, $ua, $h);
		$req->header($auth_header => $auth_value);
	    }
        };
    });
    $h->{auth_param} = $auth_param;

    if (!$proxy && !$request->header($auth_header) && $ua->credentials($host_port, $realm)) {
	# we can make sure this handler applies and retry
        add_path($h, $url->path);
        return $ua->request($request->clone, $arg, $size, $response);
    }

    my($user, $pass) = $ua->get_basic_credentials($realm, $url, $proxy);
    unless (defined $user and defined $pass) {
	$ua->set_my_handler("request_prepare", undef, @m);  # delete handler
	return $response;
    }

    # check that the password has changed
    my ($olduser, $oldpass) = $ua->credentials($host_port, $realm);
    return $response if (defined $olduser and defined $oldpass and
                         $user eq $olduser and $pass eq $oldpass);

    $ua->credentials($host_port, $realm, $user, $pass);
    add_path($h, $url->path) unless $proxy;
    return $ua->request($request->clone, $arg, $size, $response);
}

sub add_path {
    my($h, $path) = @_;
    $path =~ s,[^/]+\z,,;
    push(@{$h->{m_path_prefix}}, $path);
}

1;

haha - 2025