This function can be used by a searver to retrieve data sent
early in the handshake processes when resuming a session. This
is used to implement a zero-roundtrip (0-RTT) mode. It has the
same semantics as gnutls_record_recv().
This function can be called either in a handshake hook, or after
the handshake is complete.
The number of bytes received and zero when early data reading is
complete. A negative error code is returned in case of an error.
If no early data is received during the handshake, this function
returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE. The number of
bytes received might be less than the requested
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gnutls 3.7.1 gnutls_record_recv_early_data(3)