COMET基于HTTP长连接的推送
比如web IM 消息比轮询即时。减轻服务器压力。减少TCP三次握手的次数
1. [文件]
comnet.php
<?php
/*
Simple COMET script tested to work with IE6, IE8, IE9, Chrome 5, Chrome 10, Firefox 3.6.16, Firefox 4, Safari 5, Opera 11
*/
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
//Turn of Apache output compression
// Necessary if you have gzip setup in your httpd.conf (e.g. LoadModule deflate_module modules/mod_deflate.so)
apache_setenv('no-gzip', 1);
ini_set('zlib.output_compression', 0);
//Disable all PHP output buffering
ini_set('output_buffering', 'Off');
ini_set('implicit_flush', 1);
ob_implicit_flush(1);
for ($i = 0, $level = ob_get_level(); $i < $level; $i++) { ob_end_flush(); } //Flush all levels of the buffer to start
error_reporting(E_ALL);
?><html>
<head>
<title>Comet php backend</title>
</head>
<body>
<script type="text/javascript">
var dumpText = window.parent.dumpText;
</script>
<?php
$startTime = time();
$maxLoopTime = 100;
while(time()-$startTime < $maxLoopTime) {
echo '<script type="text/javascript">';
echo "dumpText(".time().');'.str_repeat(' ',500); //500 characters of padding
echo "</script>\r\n";
flush();
$randSleep = mt_rand(100000, 2000000); //sleep between 100 ms and 2 seconds
usleep($randSleep);
}
?>
<script type="text/javascript">dumpText("Output Finished");location.reload();</script>
</body>
</html>2. [文件] in.php
<html>
<head>
<title>Comet demo</title>
<style type="text/css">
.hiddenIframe {
position:absolute;
top:0px;
left:0px;
display:block;
z-index:-999;
visibility:hidden;
}
</style>
</head>
<body>
<p id="content">The server time will be shown here</p>
<script type="text/javascript">
var content = document.getElementById('content');
var dumpText = function(text){
content.innerHTML = content.innerHTML + '<BR>'+ text;
}
</script>
<iframe src="comnet.php"></iframe>
</body>
</html>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
Dreamweaver CS6
Visual web development tools
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
SublimeText3 Linux new version
SublimeText3 Linux latest version
SublimeText3 Mac version
God-level code editing software (SublimeText3)
