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7 changes: 5 additions & 2 deletions u_tls_extensions.go
Original file line number Diff line number Diff line change
Expand Up @@ -611,8 +611,11 @@ type ALPNExtension struct {
}

func (e *ALPNExtension) writeToUConn(uc *UConn) error {
uc.config.NextProtos = e.AlpnProtocols
uc.HandshakeState.Hello.AlpnProtocols = e.AlpnProtocols
// If ech is enabled, the uc.config.NextProtos should not be changed.
if uc.config.EncryptedClientHelloConfigList == nil {
uc.config.NextProtos = e.AlpnProtocols
uc.HandshakeState.Hello.AlpnProtocols = e.AlpnProtocols
}
return nil
}

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