ngtcp2_crypto_client_initial_cb
===============================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: int ngtcp2_crypto_client_initial_cb(ngtcp2_conn *conn, void *user_data)

    
    `ngtcp2_crypto_client_initial_cb` installs initial secrets and
    encryption keys, and sets QUIC transport parameters.
    
    This function can be directly passed to
    :member:`ngtcp2_callbacks.client_initial` field.  It is only used
    by client.
    
    This function returns 0 if it succeeds, or
    :macro:`NGTCP2_ERR_CALLBACK_FAILURE`.