Here is my code. The block in red  returns 1 (success code) in development  and also in the exe when deployed on  a machine which has PowerBuilder 2017 R3 installed

But when attempting to run this on a user machine without PowerBuilder, it returns -1 into li_rc and -3 into l_i_response

integer li_rc, l_i_response
String ls_ReturnJson, l_s_authorization
HttpClient lnv_HttpClient

lnv_HttpClient = Create HttpClient

l_s_authorization = 'Bearer' + " " +mle_accesstoken.text
lnv_HttpClient.SetRequestHeader("Authorization",l_s_authorization)

li_rc = lnv_HttpClient.SendRequest("GET", "<url site name>")

l_i_response = lnv_HttpClient.GetResponseStatusCode()
if li_rc = 1 and l_i_response = 200 then
lnv_HttpClient.GetResponseBody(ls_ReturnJson)
mle_body. text = ls_ReturnJson
Messagebox(string(l_i_response), ls_ReturnJson)
Else
lnv_HttpClient.GetResponseBody(ls_ReturnJson)
mle_body. text = ls_ReturnJson
Messagebox(string(l_i_response), string(li_rc) + '-' + ls_ReturnJson)
end if

Client machines have  pbhttpclient170.dll, pbjson170.dll, pboauth170.dll, pbrestclient170.dll in the same directory as the exe.  We have a lot of httpclient calls in our real application.  As we found that the client machine could not connect, we wrote the simple code above to check what happens when we send requests using  lnv_HttpClient.SendRequest

Any ideas, please???