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From "Anthony Geoghegan" <a...@eircom.net>
Subject Re: MVC and caching
Date Thu, 29 Aug 2002 16:52:32 GMT
Additionally to use the clientside cache as it was meant to be used have a
look at the "last-modified" response header.

Best Regards,
Anthony Geoghegan.
J2EE Developer
CPS Ireland Ltd.
----- Original Message -----
From: "Andreas Mohrig" <andreas.mohrig@cadooz.de>
To: "'Tomcat Users List'" <tomcat-user@jakarta.apache.org>
Sent: Thursday, August 29, 2002 11:57 AM
Subject: RE: MVC and caching


> Another method I once noticed has to do with never letting your user
request
> the exact same URL twice, which could be accomplished by always sending
(and
> incrementing) an additional sequence-number:
>
> 1. User gets presented with viewDetails.jsp?id=1&sequencenumber=<A_NUMBER>
> 2. User updates details, submits forms to a controller servlet
> 3. Servlet commits the changes via the model objects, and redirects to
> viewDetails.jsp?id=1&sequencenumber=<A_NUMBER+1>
> 4. ???
> 5. Profit!!! [hopefully!]
>
> This can't be cashed, since it has to be expected that the output based an
> the different input will also be different.
>
> greetings
>
> Andreas Mohrig
>
> -----Original Message-----
> From: Andreas Mohrig [mailto:andreas.mohrig@cadooz.de]
> Sent: Thursday, August 29, 2002 12:50 PM
> To: 'Tomcat Users List'
> Subject: RE: MVC and caching
>
>
> Either the browser or some proxy is caching your page. Try to tell them to
> not do that with either a http-header:
>
> response.addHeader("pragma","no-cache");  [I hope this is right]
>
> or some HTML-Tags (pick one or use all, I haven't tested them or checked
for
> compliance with the HTML-Standard; just found them on the web):
>
> <META HTTP-EQUIV="cache-control" CONTENT="no-cache">
> <META HTTP-EQUIV="Pragma" CONTENT="no-cache">
> <META HTTP-EQUIV="expires" CONTENT="Tue, 7 July 1998 10:00:00 GMT">
>
> The header seems to be preferable, since proxies might ignore the tags.
Let
> us know if you succeeded and if so, with what method.
>
> Andreas Mohrig
>
> -----Original Message-----
> From: Anthony Geoghegan [mailto:antg@eircom.net]
> Sent: Thursday, August 29, 2002 12:18 PM
> To: Tomcat Users List
> Subject: Re: MVC and caching
>
>
> Is that a client caching issue?
> If so a variety of http header settings can be used to clear a client-side
> cache.
>
> Best Regards,
> Anthony Geoghegan.
> J2EE Developer
> CPS Ireland Ltd.
> ----- Original Message -----
> From: "Josh G" <josh@gfunk007.com>
> To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
> Sent: Thursday, August 29, 2002 1:06 AM
> Subject: MVC and caching
>
>
> Hi, I'm using a model-view-controller setup for my application, and I've
run
> into problems with caching - here's a workflow:
>
> 1. User gets presented with viewDetails.jsp?id=1
> 2. User updates details, submits forms to a controller servlet
> 3. Servlet commits the changes via the model objects, and redirects to
> viewDetails.jsp?id=1
> 4. ???
> 5. Profit!!!
>
> The problem is, the user is seeing (sometimes) a cached version of
> viewDetails.jsp?id=1.... not always mind, just most of the time.
>
> Anybody run into similar problems? Is there a simple solution? Perhaps
> adding
> a variable with random data in it?
>
> Any answers appreciated!
>
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