Layouts die with 503 error

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Hey, I'm getting 503 errors after moving site to HTTPS. There's 50% chance that it will happen in Chromium browsers and Chrome. Here's how it looks in Chromium:
Failed to load resource: the server responded with a status of 503 ()

or
net::ERR_ABORTED 503

Last screenshot is for Chrome, with headers.

My Concrete5 version is 8.5.1. I disabled cache in settings.

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