selectedProtocol property

String? selectedProtocol

The protocol which was selected during protocol negotiation.

Returns null if one of the peers does not have support for ALPN, did not specify a list of supported ALPN protocols or there was no common protocol between client and server.

Implementation

String? get selectedProtocol;

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https://api.dart.dev/stable/2.13.0/dart-io/RawSecureSocket/selectedProtocol.html