error: [Errno 10053]

From the Windows Sockets Error Codes list:

WSAECONNABORTED 10053
Software caused connection abort.
An established connection was aborted by the software in your host computer, possibly due to a data transmission time-out or protocol error.

There was a timeout or other network-level error. This is your operating system closing the socket, nothing to do with Python or Flask, really.

It could be the remote browser stopped responding, the network connection died, or a firewall closed the connection because it was open too long, or any other number of reasons.

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