From
https://airbyte-public-api-docs.s3.us-east-2.amazonaws.com/rapidoc-api-docs.html#overview
When authenticating to the Configuration API, you must use Basic Authentication by setting the Authentication Header to Basic and base64 encoding the username and password (which are airbyte and password by default - so base64 encoding airbyte:password results in YWlyYnl0ZTpwYXNzd29yZA==). So the full header reads 'Authorization': "Basic YWlyYnl0ZTpwYXNzd29yZA=="