Don't Build on El Capitan Without Checking App Transport Security

I got burned this week. Pretty bad. I shipped a small bugfix release for my Mac app Word Counter a couple of days ago to prepare for the “big one” coming this week. Naturally, I built that version on my El Capitan dev machine. I pushed the update to my server. Updates using Sparkle worked. – But now users of that version cannot ever update to the next version. Because I haven’t thought about ATS.

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