If enabled, this option makes libcurl use CCC (Clear Command Channel). It shuts down the SSL/TLS layer after authenticating. The rest of the control channel communication will be unencrypted. This allows NAT routers to follow the FTP transaction. Pass a long using one of the values below
Don't attempt to use CCC.
Do not initiate the shutdown, but wait for the server to do it. Do not send a reply.
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