We have just observed same problem this morning. Accessing to an overwritten file only displays the original file. When logged in again after an hour the modified file was displayed. I have now tried again to access a modified file immediately after overwriting, the new version of file will show up only if I delete the cache file from my browser. I think this confirms your finding. What is your ticket number please? I would like to submit a case on this problem as well.
Jie
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Dr Jie Shen
Blackboard Administrator
Computer Centre
University of Leicester
Leicester
LE1 7RH
UK
tel 0116 252 2243
fax 0116 252 5027
email [log in to unmask]
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-----Original Message-----
From: Blackboard/Courseinfo userslist
[mailto:[log in to unmask]]On Behalf Of Anthony Leonard
Sent: 28 September 2005 15:20
To: [log in to unmask]
Subject: App pack 3 Content System not refreshing.
Hi all,
We've hit a serious caching problem with the App pack 3 Content System (version
2.3), and now Blackboard have now replicated it on their own servers.
Basically if a user opens any file in the content system, then modifies it, and
then opens it again, the old version will always be shown. Hitting refresh or
even logging out and back in again doesn't help. Only if the browser cache is
explicitly deleted will the new version be shown. This occurs no matter what
browser or platform is used because the error is actually with the server.
Using an HTTP sniffer shows the browser's GET request from the content system
correctly includes an "if-modified-since" header with the date of it's cached
version. However the Blackboard server wrongly responds with a "HTTP/1.0 304 Not
Modified" even when the file has indeed been modified since that date. The
browser accordingly uses it's cached version.
Blackboard's workaround is to "tell the users to set their cache to 0 Mb".
They're escalating it to their developers.
If anyone else can see this in their own systems I'd be grateful to know about
it. We're using Solaris 9, Oracle 9.0.2.
Best wishes,
Anthony Leonard.
--
Anthony Leonard <[log in to unmask]>
System Integrator
Computing Service
University of York
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