# QUIC.Stream ``` final class Stream where ApplicationProtocol : NetworkProtocolOptions ``` ## Topics ### Instance Properties [`var directionality: QUICStream.Directionality`](/documentation/Network/QUIC/Stream/directionality) The directionality of this stream, either bidirectional or unidirectional. [`var initiator: QUICStream.Initiator`](/documentation/Network/QUIC/Stream/initiator) The initiator of this QUIC stream, either client or server. [`let parent: NetworkConnection`](/documentation/Network/QUIC/Stream/parent) [`var streamApplicationErrorCode: UInt64`](/documentation/Network/QUIC/Stream/streamApplicationErrorCode) The QUIC application error code to send for the stream, or received from the peer. [`var streamID: UInt64`](/documentation/Network/QUIC/Stream/streamID) The QUIC stream identifier. ## Relationships ### Conforms To [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Hashable`](/documentation/Swift/Hashable) [`Identifiable`](/documentation/Swift/Identifiable) [`Sendable`](/documentation/Swift/Sendable) ### Inherits From [`NetworkChannel`](/documentation/Network/NetworkChannel) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)