RASA X Server on EC2 not responding to API calls

[Deprecated] Rasa X Community Edition
2

OK so I managed to get a kind of response from the server but I only get the following:

{
    "reasons": [
        "Authorization header not present."
    ],
    "exception": "Unauthorized"
}

How can I have a conversation with the bot by making API calls to the server? Any help will be greatly appreciated!