ngtcp2_crypto_picotls_configure_server_session
==============================================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto_picotls.h>*

.. function:: int ngtcp2_crypto_picotls_configure_server_session( ngtcp2_crypto_picotls_ctx *cptls)

    
    `ngtcp2_crypto_picotls_configure_server_session` configures *cptls*
    for server side QUIC connection.  It performs the following
    modifications:
    
    - Set handshake_properties.collect_extension to
      `ngtcp2_crypto_picotls_collect_extension`.
    - Set handshake_properties.collected_extensions to
      `ngtcp2_crypto_picotls_collected_extensions`.
    
    The callbacks set by this function only handle QUIC Transport
    Parameters TLS extension.  If an application needs to handle the
    other TLS extensions, set its own callbacks and call
    `ngtcp2_crypto_picotls_collect_extension` and
    `ngtcp2_crypto_picotls_collected_extensions` form them.
    
    During the QUIC handshake, the first element of
    handshake_properties.additional_extensions is assigned to send QUIC
    Transport Parameter TLS extension.  Therefore, an application must
    allocate at least 2 elements for
    handshake_properties.additional_extensions.
    
    Call `ngtcp2_crypto_picotls_deconfigure_session` to free up the
    resources.
    
    Application must set a pointer to :type:`ngtcp2_crypto_conn_ref` to
    ptls_t object by assigning the pointer using ptls_get_data_ptr, and
    :type:`ngtcp2_crypto_conn_ref` object must have
    :member:`ngtcp2_crypto_conn_ref.get_conn` field assigned to get
    :type:`ngtcp2_conn`.
    
    It returns 0 if it succeeds, or -1.