I never tried that before, but if you search in the documentation for “Http” you can find a client example in which you can perform a GET request: http://docs.godotengine.org/en/latest/tutorials/http_client_class.html
In your case you may want to use the POST method, and the data could be sent using JSON.
Thank you so much for your answer!
I’ve tried many times using the HTTPClient class and the HTTPRequest node, but nothing worked for me.
So I grabbed that HTTPClient example in the documentation and modified to make POST requests.
I tested the HTTP client with Tomcat server about three months. Three month (non stop !!!) server and HTTP client exchanged data. In three months, was no drop connection or slowdown communication.
This project set to 1920x1080 screen resolution
This page show how run the Simple Door Control project