Using curl to initiate request

Hello, I've seen that `file_get_content()` in the function `post_call` and `get_call` is used to stream requests between the client and the NlpServer, wouldn't it be better if instead of using `file_get_content()`  to use curl in its place to send and receive requests because `file_get_content()`  might be a bit problematic when it comes to cross-server requests.