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evidently it's missing the intermediate chaining cert. thanks to @aaronpk for debugging!
repro and test:
i just remembered that brid.gy's SSL requires SNI. app engine supports both VIPs and SNI for SSL on custom domains, but VIPs are naturally more expensive, so i went with SNI. not sure that's the root cause here though, since s_client won't connect even with -servername: