Re: A Caching Issue - I Suspect
From: Joerg Jooss (news-reply_at_joergjooss.de)
Date: 02/09/05
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Date: Wed, 09 Feb 2005 13:31:40 -0800
Smithers wrote:
> 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.
I agree that this has to be a caching issue. Try using a HTTP debugger
like Fiddler (www.fiddlertool.com) to check whether your browser really
still sends a new request once the image stops rotating.
Do you use GET or POST as HTTP method?
Cheers,
-- http://www.joergjooss.de mailto:news-reply@joergjooss.de
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