Must request data before anything actually happens...

src/core/posix_io.c

 	if ( ( rc = xfer_open_uri ( &file->xfer, uri_string ) ) != 0 )
 		goto err;
 
+	/* Request data */
+	if ( ( rc = xfer_request_all ( &file->xfer ) ) != 0 )
+		goto err;
+
 	/* Wait for open to succeed or fail */
 	while ( list_empty ( &file->data ) ) {
 		step();