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# kCFStreamPropertySOCKSVersion

Constant for the SOCKS version key.

```
let kCFStreamPropertySOCKSVersion: CFString
```

## Discussion

Its value must be `kCFStreamSocketSOCKSVersion4` or `kCFStreamSocketSOCKSVersion5` to set SOCKS4 or SOCKS5, respectively. If this key is not present, SOCKS5 is used by default.

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