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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<?php
/*+***********************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 *************************************************************************************/
include 'vtlib/thirdparty/network/Request.php';

/**
 * Provides API to work with HTTP Connection.
 * @package vtlib
 */
class Vtiger_Net_Client {
	var $client;
	var $url;
	var $response;

	/**
	 * Constructor
	 * @param String URL of the site
	 * Example: 
	 * $client = new Vtiger_New_Client('http://www.vtiger.com');
	 */
	function __construct($url) {
		$this->setURL($url);
	}

	/**
	 * Set another url for this instance
	 * @param String URL to use go forward
	 */
	function setURL($url) {
		$this->url = $url;
		$this->client = new HTTP_Request();
		$this->response = false;
		$this->setDefaultHeaders();
	}
	
	function setDefaultHeaders() {
		$headers = array();
		if (isset($_SERVER)) {
			global $site_URL;
			$headers['referer'] = isset($_SERVER['HTTP_REFERER'])? $_SERVER['HTTP_REFERER'] : ($site_URL . "?noreferer");
			
			if (isset($_SERVER['HTTP_USER_AGENT'])) {
				$headers['user-agent'] = $_SERVER['HTTP_USER_AGENT'];
			}
			
		} else {
			global $site_URL;
			$headers['referer'] = ($site_URL . "?noreferer");
		}
		
		$this->setHeaders($headers);
	}

	/**
	 * Set custom HTTP Headers
	 * @param Map HTTP Header and Value Pairs
	 */
	function setHeaders($values) {
		foreach($values as $key=>$value) {
			$this->client->addHeader($key, $value);
		}
	}
	
	/**
	 * Perform a GET request
	 * @param Map key-value pair or false
	 * @param Integer timeout value
	 */
	function doGet($params=false, $timeout=null) {
		if($timeout) $this->client->_timeout = $timeout;
		$this->client->setURL($this->url);
		$this->client->setMethod(HTTP_REQUEST_METHOD_GET);

		if($params) {
			foreach($params as $key=>$value) 
				$this->client->addQueryString($key, $value);
		}
		$this->response = $this->client->sendRequest();

		$content = false;
		if(!$this->wasError()) {
			$content = $this->client->getResponseBody();
		}
		$this->disconnect();
		return $content;
	}

	/**
	 * Perform a POST request
	 * @param Map key-value pair or false
	 * @param Integer timeout value
	 */
	function doPost($params=false, $timeout=null) {
		if($timeout) $this->client->_timeout = $timeout;
		$this->client->setURL($this->url);
		$this->client->setMethod(HTTP_REQUEST_METHOD_POST);

		if($params) {
			if(is_string($params)) $this->client->addRawPostData($params);
			else {
				foreach($params as $key=>$value)
					$this->client->addPostData($key, $value);
			}
		}
		$this->response = $this->client->sendRequest();

		$content = false;
		if(!$this->wasError()) {
			$content = $this->client->getResponseBody();
		}
		$this->disconnect();

		return $content;
	}
    
	/**
	 * Add File to Send with a post
	 * @param String file upload fieldname
	 * @param Mixed path of file to add
	 * @param Mixed file content type of file being uploaded(default : application/octet-stream)
	 */
	function addFiles($inputName, $filePath, $fileContentType = 'application/octet-stream') {
		$this->client->addFile($inputName, $filePath, $fileContentType);
	}

	/**
	 * Did last request resulted in error?
	 */
	function wasError() {
		// calling non-static method statically is throwing error while Cron run
		return $this->_isError();
	}

	/**
	 * Tell whether a value is a PEAR error.
	 * @return type
	 */
	function _isError() {
		$pear = new PEAR();
		return $pear->isError($this->response);
	}

	/**
	 * Disconnect this instance
	 */
	function disconnect() {
		$this->client->disconnect();
	}
}
?>

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