src/HttpClient.php
public static function getClient()
    {
        if (is_null(self::$client)) {
            self::$client = new Client(self::$defaults);
        }

        return self::$client;
    }
public static function getClient()
    {
        if (is_null(self::$client)) {
            self::$client = new Client(self::$defaults);
        }

        return self::$client;
    }
客户端
@return Client