---
title: isConstrained
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/urlsessiontasktransactionmetrics/isconstrained
---

# isConstrained

A Boolean value that indicates whether the connection operates over an interface marked as constrained.

## Declaration

```swift
var isConstrained: Bool { get }
```

## Discussion

Discussion A constrained interface is one the user marks as constrained by selecting “Low Data Mode” in the Settings app. You permit or deny use of constrained interfaces with the allowsConstrainedNetworkAccess property on URLSessionConfiguration or allowsConstrainedNetworkAccess on URLRequest.

## See Also

### Accessing transaction characteristics

- [networkProtocolName](foundation/urlsessiontasktransactionmetrics/networkprotocolname.md)
- [remoteAddress](foundation/urlsessiontasktransactionmetrics/remoteaddress.md)
- [remotePort](foundation/urlsessiontasktransactionmetrics/remoteport.md)
- [localAddress](foundation/urlsessiontasktransactionmetrics/localaddress.md)
- [localPort](foundation/urlsessiontasktransactionmetrics/localport.md)
- [negotiatedTLSCipherSuite](foundation/urlsessiontasktransactionmetrics/negotiatedtlsciphersuite.md)
- [negotiatedTLSProtocolVersion](foundation/urlsessiontasktransactionmetrics/negotiatedtlsprotocolversion.md)
- [isCellular](foundation/urlsessiontasktransactionmetrics/iscellular.md)
- [isExpensive](foundation/urlsessiontasktransactionmetrics/isexpensive.md)
- [isProxyConnection](foundation/urlsessiontasktransactionmetrics/isproxyconnection.md)
- [isReusedConnection](foundation/urlsessiontasktransactionmetrics/isreusedconnection.md)
- [isMultipath](foundation/urlsessiontasktransactionmetrics/ismultipath.md)
- [resourceFetchType](foundation/urlsessiontasktransactionmetrics/resourcefetchtype.md)
- [URLSessionTaskMetrics.ResourceFetchType](foundation/urlsessiontaskmetrics/resourcefetchtype.md)
- [domainResolutionProtocol](foundation/urlsessiontasktransactionmetrics/domainresolutionprotocol.md)