detachSocket abstract method
Future<Socket> detachSocket(Detach the underlying socket from the HTTP client. When the socket is detached the HTTP client will no longer perform any operations on it.
This is normally used when a HTTP upgrade is negotiated and the communication should continue with a different protocol.
Source
Future<Socket> detachSocket();
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https://api.dartlang.org/stable/1.24.3/dart-io/HttpClientResponse/detachSocket.html