> For the complete documentation index, see [llms.txt](https://docs.9proxy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.9proxy.com/developers/sdk/sdk-nodejs/functions/setprotocol-proto.md).

# setProtocol(proto)

Sets the protocol used for connections.

```javascript
setProtocol(proto)
```

***

## Parameters

* **proto** (<mark style="color:green;">number</mark>) – 0 = Auto, 1 = Mux, 2 = Qux

## Return Value

number (0 = success)

## Example

```javascript
// example

sdk.setProtocol(1);

```