Why do I constantly see “Resetting dropped connection” when uploading data to my database?

Requests uses Keep-Alive by default. Resetting dropped connection, from my understanding, means a connection that should be alive was dropped somehow. Possible reasons are:

1. Server doesn’t support Keep-Alive.
2. There’s no data transfer in established connections for a while, so server drops connections.

See https://stackoverflow.com/a/25239947/2142577 for more details.