puppeteer/website/versioned_docs/version-19.1.0/api/puppeteer.securitydetails.protocol.md

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---
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".