Gel Script to call Rest API

[Durga Prasanna Kuppili]

Hi Team,
We are planning to enclose Rest API in Gel script for project object. Have referred to the link  https://www.pemari.com/techie/gel-script-restapi/.It is not proceeding at the step while authenticating

<core:set var="void" value="${ClarityConnection.connect()}"/>





<core:set var="CL_isAuthenticated" value="${ClarityConnection.getHeaderField(0)}"/>

<core:set var="response_msg" value="${ClarityConnection.getResponseMessage()}"/>

<gel:log>Clarity isAuthenticated: ${CL_isAuthenticated}</gel:log>
<gel:log>Clarity Response: ${response_msg}</gel:log>

The process is completing with blank values in Clarity Authentication and response msg 

Please let me know if I am missing something.
Thanks in advance