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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [SecurityDetails](./puppeteer.securitydetails.md) &gt; [protocol](./puppeteer.securitydetails.protocol.md)

## SecurityDetails.protocol() method

<b>Signature:</b>

```typescript
protocol(): string;
```
<b>Returns:</b>

string

The security protocol being used, e.g. "TLS 1.2".

