In the end I managed to reproduce the error. The HTTP status code is 503. See log:
```
> GET /api/2.0/jobs/list HTTP/1.1
> Host: northeurope.azuredatabricks.net
... (omitted output)
HTTP/1.1 503 Service Temporarily Unavailable
... (omitted output)
{"error_code":"TEMPORARILY_UNAVAILABLE","message":""}
```
[ Full content available at:
https://github.com/apache/incubator-airflow/pull/3570 ]
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