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Caching Issues







Caching Issues

Caching Issues 12/10/2003 06:39 PM

It sounds like there are two primary caching complaints that come up over and over in my blog comments. The first is that Safari caches subresources too aggressively, and the second is that Safari fetches subresources too aggressively. :)

We found the first problem. The WebCore cache was not actually making use of the proper expiration dates, which meant the WebCore memory cache would keep using stale objects even though they should have expired. We have fixed the problem, and we believe this will solve the vast majority of the stale content issues.




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Here's an idea I came up with while on a walk tonight. There's a 50-percent chance it's already been invented — if it has, tell me where to find it.

The world needs a PC projector that will cache the displayed image. Say I'm tooling through my presentation in front of Mr. Venture Capitalist and I suddenly need to find something on a Web site.

Now, I don't want Mr. VC to see me fumbling around the Web (I'm supposed to know what I'm doing, right?), so the only choice I have is to shut off the projector or suspend the connection from the laptop so that I can Google without being displayed to the room. Room goes dark, there's an uncomfortable silence, and it's painfully obvious that everyone is waiting on me.

But what if I could freeze the image displayed from the projector? That way, VC and Co. could continue to look at the last slide I was showing them (my partner would chime in here with something witty to take the focus off me) and I could search away.

When I finally found what I needed and my screen looked like I wanted it to, I could resume the projector. Extra points if I could fade in from the last displayed image to my current screen.

Does this exist? If so, show me. If not, I just gave away a million dollar idea. That should be engraved on my tombstone.

Click here to comment on this entry


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When IE 5.5 rolled around, IE gained some ability with PNG's in the form of the AlphaImageLoader filter. In the past, I've gotten around the IE problem by using this filter, but you really have to kludge up your HTML to implement it.

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The code can be used either by a one-time copy-and-paste or as an include file. The entire thing is completely ignored by all other browsers - in fact it is treated as an HTML comment - thanks to IE's conditional comments. This solution is therefore light, portable and non-invasive to other browsers.

I wish there wasn't a need for a hack like this, but it appears that MS has stopped further development of IE. So the choice as of June 2004 is: ignore PNGs or use hacks.

He hides the script block in a c onditional comment, one of the few helpful features of IE (although I only use it to fix problems with IE, I guess 'helpful' is a bit too generous).

The script spools through all the images on the page, finds all the ones whose source ends in '.png', and changes them to spans that have the image as the background, filtered through AlphaImageLoader. So you don't need to add any special code to your PNG IMG tags in order to use it.

It should work on all non-IE browsers (since it does nothing), and all versions of IE older than 5.5. That maps to enough of the browser market to suit my tastes. The site also lists a couple of alternative ways around the problem. Well done.

Click here to comment on this entry


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