Comments on: using Javascript to refresh an image without a cache-busting parameter http://www.post-hipster.com/2008/10/20/using-javascript-to-refresh-an-image-without-a-cache-busting-parameter/ A Shady Lane, everybody wants one Thu, 04 Jun 2009 18:18:05 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Shaun http://www.post-hipster.com/2008/10/20/using-javascript-to-refresh-an-image-without-a-cache-busting-parameter/comment-page-1/#comment-610 Shaun Thu, 09 Apr 2009 20:22:53 +0000 http://www.post-hipster.com/?p=65#comment-610 thank you for this very useful post - i was having the same problem. thank you for this very useful post – i was having the same problem.

]]> By: chip http://www.post-hipster.com/2008/10/20/using-javascript-to-refresh-an-image-without-a-cache-busting-parameter/comment-page-1/#comment-77 chip Fri, 19 Dec 2008 13:22:28 +0000 http://www.post-hipster.com/?p=65#comment-77 I suppose you could make an AJAX request, parse the response headers, store the image's cache validity on your page, and use the cache-busting hack when you need to pull the image, but that seems to be a tremendous amount of work to save a couple extra HTTP requests. Remember that when a server returns a 304 response code, it's saying "This image has not changed since the last time you requested it, so use your cached copy" - I guess the trick is to make your CDN's cache of the image refresh itself correctly after the cache you set expires. HTH, Chip I suppose you could make an AJAX request, parse the response headers, store the image’s cache validity on your page, and use the cache-busting hack when you need to pull the image, but that seems to be a tremendous amount of work to save a couple extra HTTP requests.

Remember that when a server returns a 304 response code, it’s saying “This image has not changed since the last time you requested it, so use your cached copy” – I guess the trick is to make your CDN’s cache of the image refresh itself correctly after the cache you set expires.

HTH,
Chip

]]> By: yannack http://www.post-hipster.com/2008/10/20/using-javascript-to-refresh-an-image-without-a-cache-busting-parameter/comment-page-1/#comment-76 yannack Thu, 18 Dec 2008 13:10:24 +0000 http://www.post-hipster.com/?p=65#comment-76 Hello, First of all, thanks for the very interesting post, you are the first I found which tackles this issue. Your solution is, by far, the closest to what I am looking for, as a) is not good for me, and b) is starting to annoy me :) However, I would like a way for Firefox to only reload the image if it's cache validity has expired, and your solution doesn't allow this. At least, it doesn't send the request up my CDN after reaching the first proxy, but do you think there would be a way for it never to even reach the first proxy if the Firefox cache still holds a valid image? (IE doesn't seem to have this problem, only Firefox) Thanks a lot, Yannack Hello,
First of all, thanks for the very interesting post, you are the first I found which tackles this issue. Your solution is, by far, the closest to what I am looking for, as a) is not good for me, and b) is starting to annoy me :)
However, I would like a way for Firefox to only reload the image if it’s cache validity has expired, and your solution doesn’t allow this. At least, it doesn’t send the request up my CDN after reaching the first proxy, but do you think there would be a way for it never to even reach the first proxy if the Firefox cache still holds a valid image? (IE doesn’t seem to have this problem, only Firefox)
Thanks a lot,
Yannack

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