puppeteer/website/versioned_docs/version-19.4.0/api/puppeteer.securitydetails.protocol.md

---
sidebar_label: SecurityDetails.protocol
---

# SecurityDetails.protocol() method

#### Signature:

```typescript
class SecurityDetails {
  protocol(): string;
}
```

**Returns:**

string

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