---
title: assumesHTTP3Capable
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/urlrequest/assumeshttp3capable
---

# assumesHTTP3Capable

true if server endpoint is known to support HTTP/3. Enables QUIC racing without HTTP/3 service discovery. Defaults to false. The default may be true in a future OS update.

## Declaration

```swift
var assumesHTTP3Capable: Bool { get set }
```

## See Also

### Controlling request behavior

- [timeoutInterval](foundation/urlrequest/timeoutinterval.md)
- [httpShouldHandleCookies](foundation/urlrequest/httpshouldhandlecookies.md)
- [httpShouldUsePipelining](foundation/urlrequest/httpshouldusepipelining.md)
- [allowsCellularAccess](foundation/urlrequest/allowscellularaccess.md)
- [allowsPersistentDNS](foundation/urlrequest/allowspersistentdns.md)
- [cookiePartitionIdentifier](foundation/urlrequest/cookiepartitionidentifier.md)
- [requiresDNSSECValidation](foundation/urlrequest/requiresdnssecvalidation.md)