renegotiate method
Renegotiates an existing secure connection.
Renews the session keys and possibly changes the connection properties.
This repeats the SSL or TLS handshake, with options that allow clearing the session cache and requesting a client certificate.
Implementation
void renegotiate( {bool useSessionCache = true, bool requestClientCertificate = false, bool requireClientCertificate = false});
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https://api.dart.dev/stable/2.13.0/dart-io/SecureSocket/renegotiate.html