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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<?php
/**
 * Cookie holder object
 *
 * @package Requests
 * @subpackage Cookies
 */

/**
 * Cookie holder object
 *
 * @package Requests
 * @subpackage Cookies
 */
class Requests_Cookie_Jar implements ArrayAccess, IteratorAggregate {
	/**
	 * Actual item data
	 *
	 * @var array
	 */
	protected $cookies = array();

	/**
	 * Create a new jar
	 *
	 * @param array $cookies Existing cookie values
	 */
	public function __construct($cookies = array()) {
		$this->cookies = $cookies;
	}

	/**
	 * Normalise cookie data into a Requests_Cookie
	 *
	 * @param string|Requests_Cookie $cookie
	 * @return Requests_Cookie
	 */
	public function normalize_cookie($cookie, $key = null) {
		if ($cookie instanceof Requests_Cookie) {
			return $cookie;
		}

		return Requests_Cookie::parse($cookie, $key);
	}

	/**
	 * Normalise cookie data into a Requests_Cookie
	 *
	 * @codeCoverageIgnore
	 * @deprecated Use {@see Requests_Cookie_Jar::normalize_cookie}
	 * @return Requests_Cookie
	 */
	public function normalizeCookie($cookie, $key = null) {
		return $this->normalize_cookie($cookie, $key);
	}

	/**
	 * Check if the given item exists
	 *
	 * @param string $key Item key
	 * @return boolean Does the item exist?
	 */
	public function offsetExists($key) {
		return isset($this->cookies[$key]);
	}

	/**
	 * Get the value for the item
	 *
	 * @param string $key Item key
	 * @return string Item value
	 */
	public function offsetGet($key) {
		if (!isset($this->cookies[$key])) {
			return null;
		}

		return $this->cookies[$key];
	}

	/**
	 * Set the given item
	 *
	 * @throws Requests_Exception On attempting to use dictionary as list (`invalidset`)
	 *
	 * @param string $key Item name
	 * @param string $value Item value
	 */
	public function offsetSet($key, $value) {
		if ($key === null) {
			throw new Requests_Exception('Object is a dictionary, not a list', 'invalidset');
		}

		$this->cookies[$key] = $value;
	}

	/**
	 * Unset the given header
	 *
	 * @param string $key
	 */
	public function offsetUnset($key) {
		unset($this->cookies[$key]);
	}

	/**
	 * Get an iterator for the data
	 *
	 * @return ArrayIterator
	 */
	public function getIterator() {
		return new ArrayIterator($this->cookies);
	}

	/**
	 * Register the cookie handler with the request's hooking system
	 *
	 * @param Requests_Hooker $hooks Hooking system
	 */
	public function register(Requests_Hooker $hooks) {
		$hooks->register('requests.before_request', array($this, 'before_request'));
		$hooks->register('requests.before_redirect_check', array($this, 'before_redirect_check'));
	}

	/**
	 * Add Cookie header to a request if we have any
	 *
	 * As per RFC 6265, cookies are separated by '; '
	 *
	 * @param string $url
	 * @param array $headers
	 * @param array $data
	 * @param string $type
	 * @param array $options
	 */
	public function before_request($url, &$headers, &$data, &$type, &$options) {
		if (!$url instanceof Requests_IRI) {
			$url = new Requests_IRI($url);
		}

		if (!empty($this->cookies)) {
			$cookies = array();
			foreach ($this->cookies as $key => $cookie) {
				$cookie = $this->normalize_cookie($cookie, $key);

				// Skip expired cookies
				if ($cookie->is_expired()) {
					continue;
				}

				if ($cookie->domain_matches($url->host)) {
					$cookies[] = $cookie->format_for_header();
				}
			}

			$headers['Cookie'] = implode('; ', $cookies);
		}
	}

	/**
	 * Parse all cookies from a response and attach them to the response
	 *
	 * @var Requests_Response $response
	 */
	public function before_redirect_check(Requests_Response &$return) {
		$url = $return->url;
		if (!$url instanceof Requests_IRI) {
			$url = new Requests_IRI($url);
		}

		$cookies = Requests_Cookie::parse_from_headers($return->headers, $url);
		$this->cookies = array_merge($this->cookies, $cookies);
		$return->cookies = $this;
	}
}