Re: A Caching Issue - I Suspect
From: Win, Pats (IJustDunno_at_SpamThis.com)
Date: 02/11/05
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Date: Fri, 11 Feb 2005 01:36:24 -0800
Beautiful! Thanks!
"Frank Buchan" <future_legends@hotmail.com> wrote in message
news:uHmxYe%23DFHA.3732@TK2MSFTNGP14.phx.gbl...
> When you write the image to the page try making the src link in the
> format:
>
> "image_name.jpg?t={current time}"
>
> Obviously if it is a GIF file, a different extension, etc., is required.
>
> It is a bit of a hack, but if you set the {current time} to the second you
> will get a pretty much unique value. The page will then force load the
> image. It works consistently, and as far as I know circumvents evens mart
> caching on the client-side because the src is considered new due to the
> query string portion. It adds a few bytes to the return, but I suspect
> that is a small price to pay.
>
> F Buchan
>
>
>
> "Smithers" <a@b.com> wrote in message
> news:uqnzMHgDFHA.1836@tk2msftngp13.phx.gbl...
>> My ASP.NET app enables users to upload photos - after which they can
>> optionally rotate the photo (90 degrees to the left or right). They just
>> click a link that causes a postback, and server-side code then
>> manipulates the image file - after which the aspx page refreshes on the
>> client, showing the rotated version of the photo.
>>
>> In testing I have observed that sometimes the image will in fact get
>> rotated (on the server), but the aspx page in the client will refresh but
>> will not show the current version of the photo.
>>
>> Here is a typical test scenario with a test client running XP/Pro/SP2 IE6
>> connecting to separate Windows Server 2003/IIS6 in a data center
>> accessible via the Internet (i.e., this testing happens over the
>> Internet):
>> 1. Upload a photo. The aspx page shows original photo. This is good.
>> 2. Click to rotate the photo 90 to the right. The aspx page shows the
>> photo rotated 90 to the right. This is good.
>> 3. Click again to rotate the photo 90 to the right. The aspx shows the
>> photo rotated 90 from original, NOT 180 degrees as is saved on the
>> server. The photo should be upside-down at this point and it's not. This
>> is not good.
>> 4. At this point I can click to rotate the photo 90 degrees right or
>> left - and the aspx page continues to show it rotated 90 to the right -
>> which was the very first rotation (in step 2). After every rotation
>> request sent from the browser, I have verified that the image does, in
>> fact, get rotated. I verify this by viewing the image directly on/from
>> the server (not through the browser).
>>
>> I suspected that the image was getting cached on the test client - but
>> purging the cache has no effect; rebooting the client has no effect, etc.
>> The only thing that seems to actually result in the current version of
>> the rotated photo showing up in the browser is waiting - about 10 minutes
>> or so.
>>
>> FWIW: the aspx has this at the top:<%@ OutputCache Location="none" %>
>>
>> Any ideas for where the images are getting cached? What I need is the
>> ability to rotate the photos in any direction, any number of times during
>> a session, and have the current version show up in the browser.
>>
>> Thanks!
>>
>
>
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