---
title: assumesHTTP3Capable
framework: Foundation
role: symbol
role_heading: Instance Property
platforms: [iOS 14.5+, iPadOS 14.5+, Mac Catalyst 14.5+, macOS 11.3+, tvOS 14.5+, visionOS 1.0+, watchOS 7.4+]
path: foundation/urlrequest/3738175-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](timeoutinterval.md)
- [httpShouldHandleCookies](httpshouldhandlecookies.md)
- [httpShouldUsePipelining](httpshouldusepipelining.md)
- [allowsCellularAccess](allowscellularaccess.md)
- [allowsPersistentDNS](allowspersistentdns.md)
- [cookiePartitionIdentifier](cookiepartitionidentifier.md)
- [requiresDNSSECValidation](requiresdnssecvalidation.md)