Slim PHP可以向其他服务发出请求

我目前正在构建一个带有PHP后端的AngularJS应用程序。路由是使用SlimPHP完成的，我发现了一个AngularJs模块来进行基于令牌的身份验证。在后端的模块示例中，他们使用Laravel和一个名为GuzzleHttp''client（）的客户端。现在，我不确定GuzzleHttp做了什么，而Slim PHP没有做什么（如果有的话），但我试图遵循他们的例子，但我不想安装两个基本上可以做同样事情的框架。

所以我已经完成了路由，这样当向后端（auth/google）发出请求时，它会这样做：

public function google()
{
    $app = 'Slim'Slim::getInstance();
    $request = $app->request()->getBody();
    $body = json_decode($request);
    $accessTokenUrl = 'https://accounts.google.com/o/oauth2/token';
    $peopleApiUrl = 'https://www.googleapis.com/plus/v1/people/me/openIdConnect';
    $params = array(
        'code' => $body->code,
        'client_id' => $body->clientId,
        'redirect_uri' => $body->redirectUri,
        'grant_type' => 'authorization_code',
        'client_secret' => GOOGLE_SECRET
    );
    $client = new GuzzleHttp'Client();
    // Step 1. Exchange authorization code for access token.
    $accessTokenResponse = $client->post($accessTokenUrl, ['body' => $params]);
    $accessToken = $accessTokenResponse->json()['access_token'];

    $headers = array('Authorization' => 'Bearer ' . $accessToken);
    // Step 2. Retrieve profile information about the current user.
    $profileResponse = $client->get($peopleApiUrl, ['headers' => $headers]);
    $profile = $profileResponse->json();
    // Step 3a. If user is already signed in then link accounts.
    if (Request::header('Authorization'))
    {
        $user = User::where('google', '=', $profile['sub']);
        if ($user->first())
        {
            return Response::json(array('message' => 'There is already a Google account that belongs to you'), 409);
        }
        $token = explode(' ', Request::header('Authorization'))[1];
        $payloadObject = JWT::decode($token, Config::get('secrets.TOKEN_SECRET'));
        $payload = json_decode(json_encode($payloadObject), true);
        $user = User::find($payload['sub']);
        $user->google = $profile['sub'];
        $user->displayName = $user->displayName || $profile['name'];
        $user->save();
        return Response::json(array('token' => $this->createToken($user)));
    }
    // Step 3b. Create a new user account or return an existing one.
    else
    {
        $user = User::where('google', '=', $profile['sub']);
        if ($user->first())
        {
            return Response::json(array('token' => $this->createToken($user->first())));
        }
        $user = new User;
        $user->google = $profile['sub'];
        $user->displayName = $profile['name'];
        $user->save();
        return Response::json(array('token' => $this->createToken($user)));
    }
}

现在这不起作用，因为我没有安装GuzzleHttp，但我的问题是：我可以在Slim PHP中做到这一点吗？还是需要GuzzleHttp来补充它