Php Facebook SDK返回错误：操作在0毫秒后超时，接收到0个字节中的0个。Facebook SDK返回错误：28

我正在尝试使用SDK v4.0.5实现facebook登录。当用户单击“登录”时，用户需要登录到facebook才能授予权限，但当用户返回返回url时，会显示以下错误 Facebook SDK返回错误：操作在0毫秒后超时，收到0个字节中的0个字节。Facebook SDK返回错误：28

我的代码在下面

<?php

// include required files form Facebook SDK
// added in v4.0.5
require_once( 'src/Facebook/HttpClients/FacebookHttpable.php' );
require_once( 'src/Facebook/HttpClients/FacebookCurl.php' );
require_once( 'src/Facebook/HttpClients/FacebookCurlHttpClient.php' );

// added in v4.0.0
require_once( 'src/Facebook/Entities/AccessToken.php' );
require_once( 'src/Facebook/FacebookSession.php' );
require_once( 'src/Facebook/FacebookRedirectLoginHelper.php' );
require_once( 'src/Facebook/FacebookRequest.php' );
require_once( 'src/Facebook/FacebookResponse.php' );
require_once( 'src/Facebook/FacebookSDKException.php' );
require_once( 'src/Facebook/FacebookRequestException.php' );
require_once( 'src/Facebook/FacebookOtherException.php' );
require_once( 'src/Facebook/FacebookAuthorizationException.php' );
require_once( 'src/Facebook/GraphObject.php' );
require_once( 'src/Facebook/GraphSessionInfo.php' );

// added in v4.0.5
use Facebook\FacebookHttpable;
use Facebook\FacebookCurl;
use Facebook\FacebookCurlHttpClient;
// added in v4.0.0
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookOtherException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphSessionInfo;

// start session
session_start();

// init app with app id and secret
FacebookSession::setDefaultApplication('1020667531298709', 'edf4b9891cdf7385ca518392d38776b1');

// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper('http://localhost/tests/fb/test2.php/');

// see if a existing session exists
if (isset($_SESSION) && isset($_SESSION['fb_token'])) {
    // create new session from saved access_token
    $session = new FacebookSession($_SESSION['fb_token']);

    // validate the access_token to make sure it's still valid
    try {
        if (!$session->validate()) {
            $session = null;
        }
    } catch (Exception $e) {
        // catch any exceptions
        $session = null;
    }
} else {
    // no session exists

    try {
        $accessToken = $helper->getAccessToken();
        if (isset($accessToken)) {
            // Logged in!
            $_SESSION['facebook_access_token'] = (string) $accessToken;
            echo $_SESSION['facebook_access_token'];
            // Now you can redirect to another page and use the
            // access token from $_SESSION['facebook_access_token']
        } elseif ($helper->getError()) {
            // The user denied the request
            exit;
        }
        // $session = $helper->getSessionFromRedirect();
    } catch (FacebookRequestException $ex) {
        // When Facebook returns an error
    } catch (Exception $ex) {
        // When validation fails or other local issues
        echo var_dump($ex);
    }
}

// see if we have a session
if (isset($session)) {

    // save the session
    $_SESSION['fb_token'] = $session->getToken();
    // create a session using saved token or the new one we generated at login
    $session = new FacebookSession($session->getToken());

    // graph api request for user data
    $request = new FacebookRequest($session, 'GET', '/me');
    $response = $request->execute();
    // get response
    $graphObject = $response->getGraphObject()->asArray();

    // print profile data
    echo '<pre>' . print_r($graphObject, 1) . '</pre>';

    // print logout url using session and redirect_uri (logout.php page should destroy the session)
    echo '<a href="' . $helper->getLogoutUrl($session, 'http://localhost/tests/fb/test2.php') . '">Logout</a>';
} else {
    // show login url
    echo '<a href="' . $helper->getLoginUrl(array('email', 'user_friends')) . '">Login</a>';
}

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您找到解决方案了吗？