I need the browser to cache a large, mostly static .php file. I open it via ajax and want to add it to the current page.
After some research if found this
$seconds_to_cache = 3600;
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");
This works for IE, but not for chrome and firefox.
Here is the request
Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Cache-Control max-age=0
Connection keep-alive
Content-Type application/x-www-form-urlencoded
Cookie PHPSESSID=5dkvr42f4it8pnnnqpesj6l413
Host localhost
Referer http://localhost/mifa/Suche.php
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1
charset utf-8
and here the response header
Cache-Control max-age=3600
Connection Keep-Alive
Content-Type text/html
Date Thu, 05 Jul 2012 15:28:22 GMT
Expires Thu, 05 Jul 2012 16:28:22 GMT
Keep-Alive timeout=5, max=91
Pragma cache
Server Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/1.0.0e PHP/5.3.8 mod_perl/2.0.4 Perl/v5.10.1
Transfer-Encoding chunked
X-Powered-By PHP/5.3.8
What do i need to change?
EDIT
Apparently, only IE does not append the Cache-Control max-age=0 to the request.
Here is the JS Function of the request
url = "includes/Orte.php";
obj.onreadystatechange = rState;
obj.open("GET", url, true);
obj.setRequestHeader("Pragma", "");
obj.setRequestHeader("Cache-Control", "");
obj.setRequestHeader("charset", "utf-8");
obj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
obj.setRequestHeader("Connection", "close");
obj.send();
function rState(){
if(obj.readyState == 4){
if (obj.status == 200){
//alert("Response Text Ajax:\n" + obj.responseText + "\nEnd Response Text");
}
}
}