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