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<p style="margin: 10px 0 0 0">I'm doing some research into the browser UI needed to facilitate the PropagateLogout flow. I had in mind two approaches from the beginning, and testing proves both problematic:</p>
<p style="margin: 10px 0 0 0">1. Embedded iframes<br /> 2. Script-driven (i.e. ajax) requests</p>
<p style="margin: 10px 0 0 0">I was surprised that you can't access the headers of an iframe element to report status, fail, or otherwise coordinate the behavior in the browser, which I believe rules it out. The downside of scripting, is of course, scripting, but I'm fairly certain we'll need to use some kind of scripted solution to achieve the coordination needed for some of the SAML2 logout profiles if not generally to simply report status.</p>
<p style="margin: 10px 0 0 0">I realized almost immediately that there's a more fundamental problem: both approaches require cross-domain requests, and modern browsers have security constraints that prevent those except where explicitly permitted. That begs a question: what constraints are we willing to impose on deployers to make SLO work? Would it be reasonable to require SPs wishing to participate in SLO to add a configuration directive like the following?</p>
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Header set Access-Control-Allow-Origin <span class="code-quote" style="color: #009100">"*"</span>
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