. This option was introduced in OpenSSL 3.2.0. Kernel TLS is off by default as of OpenSSL 3.2.0.</p>

</dd>
<dt id="sendfile"><b>-sendfile</b></dt>
<dd>

<p>If this option is set and KTLS is enabled, SSL_sendfile() will be used instead of BIO_write() to send the HTTP response requested by a client. This option is only valid when <b>-ktls</b> along with <b>-WWW</b> or <b>-HTTP</b> are specified.</p>

</dd>
<dt id="zerocopy_sendfile"><b>-zerocopy_sendfile</b></dt>
<dd>

<p>If this option is set, SSL_sendfile(