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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Cookie size is obviously a consideration, which leads to determining whether it's at all possible to look at HTML storage, but that's considerably harder with the SP.</p> <p style="margin: 10px 0 0 0">One subtle issue no matter what we support is last access updates, which is one of the more annoying things the session cache has to do now to honor timeouts. In looking at the code, I think this is not practical. Not just due to efficiency, though that's a major reason, but architecturally the SP simply isn't equipped to set/update cookies in the course of processing arbitrary application requests. It only does that now when it's issuing its own HTTP response content.</p> <p style="margin: 10px 0 0 0">My inclination is to say that timeouts won't cross nodes, in other words resetting the timeout clock any time a session has to be reconstituted on a different node. I'm pretty comfortable with that caveat, particularly if it's specific to this optional feature. I think stickiness is still a given.</p> <p style="margin: 10px 0 0 0">The general design here would be to buffer sessions in shibd or Apache as now, so the client side store only "loads" when a node boundary is crossed or shibd restarts. That makes cookies relatively easy to implement, and makes HTML storage at least theoretically practical.</p> <p style="margin: 10px 0 0 0">The problem there is POST, because we'd be interrupting arbitrary application interaction and interjecting the storage load sequence. I don't know how real-world practical the Apache support we added for POST preservation is, but I do think we'd have to manage to get it implemented on IIS if we wanted this to be practical. I asked <a href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=rdw%40iay.org.uk" class="user-hover" rel="rdw@iay.org.uk" style="color: #3b73af; text-decoration: none">Rod Widdowson</a> to look into whether the native APIs we're moving to could handle that.</p> </td>
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