Service unavailable
The web server could not get a response from the application. It returns this code with status 502, 503 or 504.
"type": "https://ohlc.io/problems/upstream-unavailable"
Why it happens
- The application was restarting or overloaded.
- A request ran past the gateway timeout.
How to fix it
- Retry with bounded exponential backoff.
- Email [email protected] with the time in UTC if it persists.