Facebook 登录集成未捕获异常 "could not connect to host"

Question

我正在尝试使用 YouTube 上提供的 PacketCode 教程学习 facebook 集成。该代码在我的本地主机上运行良好（即使通过登录 facebook 进行测试）。但是当我尝试运行 Hostinger.in 免费主机上的代码时，它显示以下错误：

Fatal error: Uncaught exception 'Facebook\FacebookSDKException' with message 'couldn't connect to host' in /home/u315632576/public_html/fblogin-basic-master/lib/Facebook/HttpClients/FacebookCurlHttpClient.php:142 Stack trace: #0 /home/u315632576/public_html/fblogin-basic-master/lib/Facebook/FacebookRequest.php(248): Facebook\HttpClients\FacebookCurlHttpClient->send('https://graph.f...', 'GET', Array) #1 /home/u315632576/public_html/fblogin-basic-master/lib/Facebook/FacebookRedirectLoginHelper.php(146): Facebook\FacebookRequest->execute() #2 /home/u315632576/public_html/fblogin-basic-master/index.php(54): Facebook\FacebookRedirectLoginHelper->getSessionFromRedirect() #3 {main} thrown in /home/u315632576/public_html/fblogin-basic-master/lib/Facebook/HttpClients/FacebookCurlHttpClient.php on line 142

在此之后，我通过在他的付费托管服务器上请求付费主机所有者来尝试运行宁此代码，代码仍然可以正常工作。那么 Hostinger.in 免费主机服务器可能有什么问题？

代码为：

/* INCLUSION OF LIBRARY FILEs*/
    require_once( 'lib/Facebook/FacebookSession.php');
    require_once( 'lib/Facebook/FacebookRequest.php' );
    require_once( 'lib/Facebook/FacebookResponse.php' );
    require_once( 'lib/Facebook/FacebookSDKException.php' );
    require_once( 'lib/Facebook/FacebookRequestException.php' );
    require_once( 'lib/Facebook/FacebookRedirectLoginHelper.php');
    require_once( 'lib/Facebook/FacebookAuthorizationException.php' );
    require_once( 'lib/Facebook/GraphObject.php' );
    require_once( 'lib/Facebook/GraphUser.php' );
    require_once( 'lib/Facebook/GraphSessionInfo.php' );
    require_once( 'lib/Facebook/Entities/AccessToken.php');
    require_once( 'lib/Facebook/HttpClients/FacebookCurl.php' );
    require_once( 'lib/Facebook/HttpClients/FacebookHttpable.php');
    require_once( 'lib/Facebook/HttpClients/FacebookCurlHttpClient.php');

/* USE NAMESPACES */

    use Facebook\FacebookSession;
    use Facebook\FacebookRedirectLoginHelper;
    use Facebook\FacebookRequest;
    use Facebook\FacebookResponse;
    use Facebook\FacebookSDKException;
    use Facebook\FacebookRequestException;
    use Facebook\FacebookAuthorizationException;
    use Facebook\GraphObject;
    use Facebook\GraphUser;
    use Facebook\GraphSessionInfo;
    use Facebook\FacebookHttpable;
    use Facebook\FacebookCurlHttpClient;
    use Facebook\FacebookCurl;

/*PROCESS*/

    //1.Stat Session
     session_start();
    //2.Use app id,secret and redirect url
     $app_id = 'xyz';
     $app_secret = 'abcd';
     $redirect_url='http://www.rohansanap.com/fblogin-basic-master/';

     //3.Initialize application, create helper object and get fb sess
     FacebookSession::setDefaultApplication($app_id,$app_secret);
     $helper = new FacebookRedirectLoginHelper($redirect_url);
     $sess = $helper->getSessionFromRedirect();

    //4. if fb sess exists echo name 
        if(isset($sess)){
            //create request object,execute and capture response
        $request = new FacebookRequest($sess, 'GET', '/me');
        // from response get graph object
        $response = $request->execute();
        $graph = $response->getGraphObject(GraphUser::className());
        // use graph object methods to get user details
        $name= $graph->getName();
        echo "hi $name";
    }else{
        //else echo login
        echo '<a href='.$helper->getLoginUrl().'>Login with facebook</a>';
    }

编辑 1：我在上面提到过，相同的代码在本地主机上运行良好。我刚刚意识到它在第一次运行时工作正常，如果我在那之后刷新页面，会显示相同的错误！

Answer 1

您的服务器可能会阻止传出的 CURL 请求，请联系您的提供商并询问他是否可以打开对 Facebook API 服务器的访问权限 (graph.facebook.com)。 see this.

Facebook 登录集成未捕获异常 "could not connect to host"

Facebook login integration uncaught exception "could not connect to host"

facebook

webserver

facebook-php-sdk

web-hosting

facebook-apps