Creates a Soup.Message with authorization headers set.
Creates a new HTTP message with the specified method and URL, and automatically adds the Authorization header if an API key is configured.
| method |
HTTP method (e.g., "GET", "POST") |
| url |
Full URL for the request |
| body |
Optional request body string (will be set as JSON content type) |
|
A new Soup.Message with authorization headers configured |