iving data</h2>

<p>As with the blocking QUIC client demo we use the <a href="../man3/SSL_write_ex.html">SSL_write_ex(3)</a> function to send data to the server. As with <a href="../man3/SSL_connect.html">SSL_connect(3)</a> above, because we are using a nonblocking <b>SSL</b> object, this call could fail with a non-fatal error. In that case we should retry exactly the same <a href="../man3/SSL_write_ex.html">SSL_write_ex(3)</a> call again. Note that the parameters must be <i>exactly</i> the same, i.e. the s