This solution is written in PHP, but it should be easily adapted to other languages.
The original .htaccess regex can cause problems with files like json-1.3.js. The solution is to only rewrite if there are exactly 10 digits at the end. (Because 10 digits covers all timestamps from 9/9/2001 to 11/20/2286.)
First, we use the following rewrite rule in .htaccess:
RewriteEngine on
RewriteRule ^(.*)\.[\d]{10}\.(css|js)$ $1.$2 [L]
Now, we write the following PHP function:
/**
* Given a file, i.e. /css/base.css, replaces it with a string containing the
* file's mtime, i.e. /css/base.1221534296.css.
*
* @param $file The file to be loaded. Must be an absolute path (i.e.
* starting with slash).
*/
function auto_version($file)
{
if(strpos($file, '/') !== 0 || !file_exists($_SERVER['DOCUMENT_ROOT'] . $file))
return $file;
$mtime = filemtime($_SERVER['DOCUMENT_ROOT'] . $file);
return preg_replace('{\\.([^./]+)$}', ".$mtime.\$1", $file);
}
Now, wherever you include your CSS, change it from this:
<link rel="stylesheet" href="/css/base.css" type="text/css" />
To this:
<link rel="stylesheet" href="<?php echo auto_version('/css/base.css'); ?>" type="text/css" />
This way, you never have to modify the link tag again, and the user will always see the latest CSS. The browser will be able to cache the CSS file, but when you make any changes to your CSS the browser will see this as a new URL, so it won't use the cached copy.
This can also work with images, favicons, and JavaScript. Basically anything that is not dynamically generated.
We had this type of problem, but slightly in reverse to your situation - we were providing the iframed content to sites on other domains, so the same origin policy was also an issue. After many hours spent trawling google, we eventually found a (somewhat..) workable solution, which you may be able to adapt to your needs.
There is a way around the same origin policy, but it requires changes on both the iframed content and the framing page, so if you haven't the ability to request changes on both sides, this method won't be very useful to you, i'm afraid.
There's a browser quirk which allows us to skirt the same origin policy - javascript can communicate either with pages on its own domain, or with pages it has iframed, but never pages in which it is framed, e.g. if you have:
www.foo.com/home.html, which iframes
|-> www.bar.net/framed.html, which iframes
|-> www.foo.com/helper.html
then home.html can communicate with framed.html (iframed) and helper.html (same domain).
Communication options for each page:
+-------------------------+-----------+-------------+-------------+
| | home.html | framed.html | helper.html |
+-------------------------+-----------+-------------+-------------+
| www.foo.com/home.html | N/A | YES | YES |
| www.bar.net/framed.html | NO | N/A | YES |
| www.foo.com/helper.html | YES | YES | N/A |
+-------------------------+-----------+-------------+-------------+
framed.html can send messages to helper.html (iframed) but not home.html (child can't communicate cross-domain with parent).
The key here is that helper.html can receive messages from framed.html, and can also communicate with home.html.
So essentially, when framed.html loads, it works out its own height, tells helper.html, which passes the message on to home.html, which can then resize the iframe in which framed.html sits.
The simplest way we found to pass messages from framed.html to helper.html was through a URL argument. To do this, framed.html has an iframe with src='' specified. When its onload fires, it evaluates its own height, and sets the src of the iframe at this point to helper.html?height=N
There's an explanation here of how facebook handle it, which may be slightly clearer than mine above!
Code
In www.foo.com/home.html, the following javascript code is required (this can be loaded from a .js file on any domain, incidentally..):
<script>
// Resize iframe to full height
function resizeIframe(height)
{
// "+60" is a general rule of thumb to allow for differences in
// IE & and FF height reporting, can be adjusted as required..
document.getElementById('frame_name_here').height = parseInt(height)+60;
}
</script>
<iframe id='frame_name_here' src='http://www.bar.net/framed.html'></iframe>
In www.bar.net/framed.html:
<body onload="iframeResizePipe()">
<iframe id="helpframe" src='' height='0' width='0' frameborder='0'></iframe>
<script type="text/javascript">
function iframeResizePipe()
{
// What's the page height?
var height = document.body.scrollHeight;
// Going to 'pipe' the data to the parent through the helpframe..
var pipe = document.getElementById('helpframe');
// Cachebuster a precaution here to stop browser caching interfering
pipe.src = 'http://www.foo.com/helper.html?height='+height+'&cacheb='+Math.random();
}
</script>
Contents of www.foo.com/helper.html:
<html>
<!--
This page is on the same domain as the parent, so can
communicate with it to order the iframe window resizing
to fit the content
-->
<body onload="parentIframeResize()">
<script>
// Tell the parent iframe what height the iframe needs to be
function parentIframeResize()
{
var height = getParam('height');
// This works as our parent's parent is on our domain..
parent.parent.resizeIframe(height);
}
// Helper function, parse param from request string
function getParam( name )
{
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( results == null )
return "";
else
return results[1];
}
</script>
</body>
</html>
Best Answer
add the current time to the query at the end of the url: