Sets the minimum SSL/TLS protocol version to use. Valid values are currently:
TLSv1.3. Older versions of the OpenSSL library do not support all values; an error will be raised if an unsupported setting is chosen. Protocol versions before TLS 1.0, namely SSL version 2 and 3, are always disabled.
The default is
TLSv1, mainly to support older versions of the OpenSSL library. You might want to set this to a higher value if all software components can support the newer protocol versions.