As a slight side bar...
I've had some problems from a usability point of view. I've never had
any problems with any IE's or Opera caching things when I set the
following:
response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy
server
In my case, the page being preserved in a back button move is actually
_desired_ as we have some power users who benefit from this. However,
both browsers regularly give "This page has expired" notices which are
ugly and frustrating - any suggestions?
chanoch
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-----Original Message-----
From: David Graham [mailto:[EMAIL PROTECTED]]
Sent: 23 September 2002 19:14
To: [EMAIL PROTECTED]
Subject: Re: Browser's cache
No that is not what I meant. I understand that it sets those header
parameters but that doesn't mean the browser necessarily cares about
them.
We tried to do this with IE 5 and 5.5 without much success. I think
Eddie's
idea would work without needing to alter the struts code.
Dave
>From: "BONNET Francois-Xavier"
><[EMAIL PROTECTED]>
>Reply-To: "Struts Developers List" <[EMAIL PROTECTED]>
>To: "Struts Developers List" <[EMAIL PROTECTED]>
>Subject: Re: Browser's cache
>Date: Mon, 23 Sep 2002 18:06:34 +0200
>
>Actually, when you set "nocache" parameter to "true" Struts sets 3 HTTP
>headers :
> ...
> response.setHeader("Pragma", "No-cache");
> response.setHeader("Cache-Control", "no-cache");
> response.setDateHeader("Expires", 1);
> ...
>
>With these 3 headers, you can be sure that your page is not stored on
>disk cache, this works with every borwser even IE. When you say IE
>doesn't read that tag properly, I suppose you mean IE reuses its memory
>cache when you use "back" button. This is allowed by HTTP 1.0
>specification (RFC 1945). If you go to the page by clicking a link, it
>is going to be refreshed.
>
>My goal is to help developpers optimizing browsers caches without
>having to know perfectly HTTP 1.0 specification and without setting
>http headers in their action classes.
>
>----- Original Message -----
>From: "David Graham" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Monday, September 23, 2002 17:40
>Subject: Re: Browser's cache
>
>
>All browsers do not listen to the nocache meta tag, which is what I
>think you're talking about. Even IE doesn't read that tag properly.
>So, it may not be worth the effort to add this to struts. Your struts
>actions classes could add the nocache header to the response before
>sending which would acheive what you want just not through
>struts-config.xml.
>
>Dave
>
>
> >From: "BONNET Francois-Xavier"
> ><[EMAIL PROTECTED]>
> >Reply-To: "Struts Developers List" <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Subject: Browser's cache
> >Date: Mon, 23 Sep 2002 16:55:26 +0200
> >
> >Hi everyone,
> >
> >
> >A good way to improve applications performances is to use browsers
>caches,
> >reusing a cached page makes you save a lot of CPU and network
> >traffic.
> >
> >HTTP protocol is rich enough to let you decide when you want a page
> >to be recalculated or retreived from cache but Struts does not take
> >advantage
>of
> >this : you can only set the parameter "nocache" of ActionServlet to
>"true"
> >or "false". I think it would be usefull if Struts could do more.
> >
> >Has someone already worked on this ?
> >If not I could work on it
> >
> >What I would like to add to Struts is being able to set each action's
>cache
> >control parameters in struts-config file
> >I can see 5 types of actions :
> >1) Actions that can be cached for a given amount of time -> using
HTTP
> >headers "Expires" and "Max-Age"
> >2) Actions than can be cached but need a conditional request, up
to
>the
> >action to decide if cached version can be reused -> using headers
> >"Last-Modified" and "E-tag"
> >3) Actions that must be refreshed depending of the value of a
token.
> >This
> >could be obtained by extending <html:link> tag to add the token to
> >the
>URL
> >so that the URL of the action in calling pages changes.
> >4) Actions that must not be cached at all.
> >5) Actions that can be cached with no limit
> >
> >Someone interested ?
> >
> >
> >Thanks,
> >
> >Francois-Xavier Bonnet
> >
> >
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>
>
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