I searched Freshservice API documentation for the API that you are trying to consume here. But I wasn’t able to find. Am I looking at the wrong place? Can you share me the link to that section of the doc?
As response is not mentioned in your post, I am wondering
Did the request fail? (Is it problem at Req API end)
Did FS didn’t respond? (Is it problem with FS API)
Could there be any issue with the query string?
Can you please share the response so that I can get little clarity on this part in order to help you out?