Hi hayata ,
It seems a syntax error. for using http.client.request the "https" and "URL" are two different parameters.
you may need to pass something like:
<#assign http_client_request = http.client.request("http", "www.somewebservicedomain.com", "/some/web/service") />
Documentation for the same can be found over here:
https://developer.khoros.com/khoroscommunitydevdocs/reference/httpclientrequest#httpclientrequesturl
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Regards
Tarun Kumar