56 lines
1.4 KiB
PHP
56 lines
1.4 KiB
PHP
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<?php
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/*
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* @package AJAX_Chat
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* @author Sebastian Tschan
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* @copyright (c) Sebastian Tschan
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* @license GNU Affero General Public License
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* @link https://blueimp.net/ajax/
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*/
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// Class to manage HTTP header
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class AJAXChatHTTPHeader {
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var $_contentType;
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var $_constant;
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var $_noCache;
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function __construct($encoding='UTF-8', $contentType=null, $noCache=true) {
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if($contentType) {
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$this->_contentType = $contentType.'; charset='.$encoding;
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$this->_constant = true;
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} else {
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if(isset($_SERVER['HTTP_ACCEPT']) && (strpos($_SERVER['HTTP_ACCEPT'],'application/xhtml+xml') !== false)) {
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$this->_contentType = 'application/xhtml+xml; charset='.$encoding;
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} else {
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$this->_contentType = 'text/html; charset='.$encoding;
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}
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$this->_constant = false;
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}
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$this->_noCache = $noCache;
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}
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// Method to send the HTTP header:
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function send() {
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// Prevent caching:
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if($this->_noCache) {
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header('Cache-Control: no-cache, must-revalidate');
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header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
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}
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// Send the content-type-header:
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header('Content-Type: '.$this->_contentType);
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// Send vary header if content-type varies (important for proxy-caches):
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if(!$this->_constant) {
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header('Vary: Accept');
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}
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}
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// Method to return the content-type string:
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function getContentType() {
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// Return the content-type string:
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return $this->_contentType;
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}
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}
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?>
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