col-level messages and the TLS protocol is not designed to measure network timings. In some cases the processing time can be significant, especially when the processing includes asymmetric cryptographic operations.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>Returns 1 if the TLS handshake RTT is successfully retrieved. Returns 0 if the TLS handshake RTT cannot be determined yet. Returns -1 if, while retrieving the TLS handshake RTT, an error occurs.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyrigh