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From "Dennis Dam (JIRA)" <jetspeed-...@portals.apache.org>
Subject [jira] Created: (JS2-930) Expires header set to 0 does not cause round-trip in IE
Date Wed, 18 Feb 2009 09:45:03 GMT
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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