My site started returning HTTP 500 on every request today. Not a slow page, not one broken route. The entire app was down. Here's what it turned out to be and how I stopped it from happening again, in case it saves someone a bad afternoon. The symptom Every request returned a bare Internal Server Error . The app container was technically "online" in my host's dashboard, but nothing rendered. Checking the response headers confirmed the 500 was coming from my app, not the CDN or a...