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From "Dennis Dam (JIRA)" <jetspeed-...@portals.apache.org>
Subject [jira] Commented: (JS2-930) Expires header set to 0 does not cause round-trip in IE
Date Wed, 18 Feb 2009 14:09:02 GMT

    [ https://issues.apache.org/jira/browse/JS2-930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674624#action_12674624

Dennis Dam commented on JS2-930:

I wasn't able to reproduce this bug in IE 5.5 / 6 / 7 using Jetspeed 2.2-SNAPSHOT

What I did:

Installed jetspeed trunk in a local tomcat.
Go to http://localhost:8080/jetspeed/portal
Go to a random page
Press back button
In Fiddler I see the round-trip happening for IE 5.5 / 6 / 7. Btw, also tested it in Chrome:
works fine as well.

Also tested it with the Jetspeed desktop (Ajaxized version of the portal, http://localhost:8080/desktop),
navigating back and forth using the back/forward button does not show outdated content. Using
Fiddler, I see the caching headers mentioned above. Remco, could you provide more details
on this issue? 

> Expires header set to 0 does not cause round-trip in IE
> -------------------------------------------------------
>                 Key: JS2-930
>                 URL: https://issues.apache.org/jira/browse/JS2-930
>             Project: Jetspeed 2
>          Issue Type: Bug
>          Components: Components Core
>            Reporter: Dennis Dam
>            Assignee: Dennis Dam
>            Priority: Minor
>             Fix For: 2.2
> As reported by Remco Nabuurs. Jetspeed sets the following HTTP response headers by default:
> Cache-Control: no-store, no-cache, private
> Pragma: no-cache
> Expires: 0
> To force a round trip in IE when pressing the BACK button, the expires header needs to
be set to -1.  Firefox and Safari assign a higher priority to the expires header and perform
a round trip. When an application makes use of Ajax calls in-between requests, and an application
architecture is adhered (the Ajax calls change server state), this leads to pages with out-of-sync

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