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# Backend.tlsMaxVersion

The read-only **`tlsMaxVersion`** property of a `Backend` instance is the max TLS version
it is configured to use, as a number, either `1.0`, `1.1`, `1.2`, or `1.3`.

When not used, or for environments that do not support this feature, such as Viceroy, `null`
may be returned.

## Value

A `number` or `null`.
