Hi,
Here is the link for the blog: https://scn.sap.com/people/thomas.jung/blog/2005/05/13/calling-webservices-from-abap-via-https
You could also refer this help: https://help.sap.com/saphelp_nw70ehp1/helpdata/en/bf/d005244e9d1d4d92b2fe7935556b4c/frameset.htm
Regards,
Kiran