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<p style="margin: 10px 0 0 0">Some re-learning from history and some new information:</p>
<p style="margin: 10px 0 0 0">The addition of the sender identity to the pooling was actually because I discovered libcurl would reuse connections even if the certificate was different in 2008. So..guess I should have reported that? Oops. They still haven't really fixed that, but I noted in a comment to their commit that checking cert filenames is only workable for file-based certificate attachment.</p>
<p style="margin: 10px 0 0 0">The connection pool and SSL session pool is per-easy-handle, so there shouldn't be a risk of cross-contamination. In fact there's a whole CURL_SHARE feature I had no idea existed that can be used to implement locking around a shared connection pool across handles. So it's not going to do it by accident.</p>
<p style="margin: 10px 0 0 0">I also analyzed the commits and it appears to me that their fix for the SSL session issue also won't notice me attaching certs in code. So basically they didn't do anything but address the trivial case of hardwired file certs and I don't think this patch is going to change anything for us anyway.</p>
<p style="margin: 10px 0 0 0">My conclusion is that the patch itself is a no-op, which answers one of the questions raised.</p>
<p style="margin: 10px 0 0 0">The other question is whether we need to do anything in light of what they didn't do, address the actual issue of session reuse across a cert change. I don't think I explicitly felt that was needed, but I think a way to flush the cache without restarting shibd is something we should look at in the future.</p>
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