main.gd

func _ready():
	# the bedroom is the first scene, so set up the bedroom assistant
	var bedroom_assistant = MyAssistant.new()
	add_child(bedroom_assistant)
	bedroom_assistant.connect("session_obtained", self, "_on_session_obtained")
	bedroom_assistant.get_session("idstring")
	
func _on_session_obtained():
	# hide the loading button and unhide the start button
	$HBoxContainer/CenterContainer/VBoxContainer/LoadingLabel.hide()
	$HBoxContainer/CenterContainer/VBoxContainer/StartButton.show()

MyAssistant.gd

class_name MyAssistant
extends HTTPRequest

var session_id
signal session_obtained

func get_session(assistant_id):
	connect("request_completed", self, "_session_request_completed")
	
	# set up authentication 
	var auth=str("Basic ", Marshalls.utf8_to_base64(str("apikey", ":", Globals.WATSON_API_KEY))) 
	var headers=["Content-Type: application/json","Authorization: "+auth]

	var session_format_url = Globals.ASSISTANT_BASEURL + "/%s/sessions?version=2020-04-01"
	var session_url = session_format_url % assistant_id

	var error = request(session_url, headers, true, HTTPClient.METHOD_POST, "{}")

	if error != OK:
		push_error("An error occurred in the HTTP request.")

func _session_request_completed(_result, _response_code, _headers, body):
	var json = JSON.parse(body.get_string_from_utf8())
	if Globals.DEBUG_BUILD:
		print(json.result)
	session_id = json.result["session_id"]
	emit_signal("session_obtained", session_id)