For years, programmers used .dev domains for testing their code. Those days are over.

In the course of my work I sometimes test features on unreleased, upcoming versions of browsers. Earlier this week I opened up the upcoming version of Chrome only to find that the Medium’s development environment — the system we use to build Medium every day — wouldn’t load. Instead, all I saw was this error:

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Image for post

Our development environment worked in the stable version of Chrome, so there had to be something different about this new version. After some sleuthing, I figured out what had changed.

Our development domain name,, wouldn’t work in the new version of Chrome unless we accessed it through a secure connection or changed the name. As I read more about the issue I learned that it’s not just Chrome, and we’re not the only ones who face this problem. …


Daryl Koopersmith

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