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。 sh-3ll

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#
# httpauth.rb -- HTTP access authentication
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: httpauth.rb,v 1.14 2003/07/22 19:20:42 gotoyuzo Exp $

require 'webrick/httpauth/basicauth'
require 'webrick/httpauth/digestauth'
require 'webrick/httpauth/htpasswd'
require 'webrick/httpauth/htdigest'
require 'webrick/httpauth/htgroup'

module WEBrick
  module HTTPAuth
    module_function

    def _basic_auth(req, res, realm, req_field, res_field, err_type, block)
      user = pass = nil
      if /^Basic\s+(.*)/o =~ req[req_field]
        userpass = $1
        user, pass = userpass.unpack("m*")[0].split(":", 2)
      end
      if block.call(user, pass)
        req.user = user
        return
      end
      res[res_field] = "Basic realm=\"#{realm}\""
      raise err_type
    end

    def basic_auth(req, res, realm, &block)
      _basic_auth(req, res, realm, "Authorization", "WWW-Authenticate",
                  HTTPStatus::Unauthorized, block)
    end

    def proxy_basic_auth(req, res, realm, &block)
      _basic_auth(req, res, realm, "Proxy-Authorization", "Proxy-Authenticate",
                  HTTPStatus::ProxyAuthenticationRequired, block)
    end
  end
end