CLOSE_FLAG_TRANSPORT</b> is set, this may be set to a QUIC frame type number which caused the connection to be closed. It may also be set to 0 if no frame type was specified as causing the connection to be closed. If <b>SSL_CONN_CLOSE_FLAG_TRANSPORT</b> is not set, this is set to 0.</p>

</dd>
<dt id="reason"><i>reason</i></dt>
<dd>

<p>If non-NULL, this is intended to be a UTF-8 textual string briefly describing the reason for connection closure. The length of the reason string in bytes is given in <i>reas