This article will provide information on changing the configuration of VS to SSL enabled (http-->https) using REST API calls.
As is DevTest doesn't provide the functionality of changing the VS from http to https with API call but it can be done manually by editing each VS manually.
Need a more robust solution which should help when modifying 100+ VS's.
Release : 10.x
Component : DevTest Virtual Service
Functionality need to be customized to change many VS from http-->https.
Attached is the test case from Services which can be used/extended to achieve the functionality.