wp_remote_retrieve_response_message( array|WP_Error $response )

Source

File: wp-includes/http.php

function wp_remote_retrieve_response_message( $response ) {
	if ( is_wp_error( $response ) || ! isset( $response['response'] ) || ! is_array( $response['response'] ) ) {
		return '';
	}

	return $response['response']['message'];
}