Function start_server_with_api_key 

pub async fn start_server_with_api_key<P: AsRef<Path> + Send + 'static>(
    path: P,
    addr: &str,
    shutdown_rx: Receiver<()>,
    api_key: String,
) -> Result<(), Box<dyn Error>>

Start server (insecure) requiring an API key for all RPCs.