在Heroku上部署Fb应用程序

我是Heroku的新手。有时候，我一直试图在Heroku上为Fb部署应用程序，但未见成功。我曾尝试在互联网上寻找解决方案，但没有找到任何分步指南，所以我在这里问。

我的Fb应用程式程式码“ index.php”

<?php
session_start();
require_once __DIR__ . '/fbsdk/autoload.php';

$fb = new Facebook\Facebook([
'app_id' => '************',
'app_secret' => '**********',
'default_graph_version' => 'v2.4',]);
 $helper = $fb->getCanvasHelper();
 $permissions = ['email']; 

try {
if (isset($_SESSION['facebook_access_token'])) {
$accessToken = $_SESSION['facebook_access_token'];
} else {
    $accessToken = $helper->getAccessToken();
}
} catch(Facebook\Exceptions\FacebookResponseException $e) {
} catch(Facebook\Exceptions\FacebookSDKException $e) {
}

if (isset($accessToken)) {

if (isset($_SESSION['facebook_access_token'])) {
    $fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
} else {
    $_SESSION['facebook_access_token'] = (string) $accessToken;
    $oAuth2Client = $fb->getOAuth2Client();
    $longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($_SESSION['facebook_access_token']);
    $_SESSION['facebook_access_token'] = (string) $longLivedAccessToken;
    $fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
}

try {
    $request = $fb->get('/me');
} catch(Facebook\Exceptions\FacebookResponseException $e) {
    if ($e->getCode() == 190) {
        unset($_SESSION['facebook_access_token']);
        $helper = $fb->getRedirectLoginHelper();
        $loginUrl = $helper->getLoginUrl('https://apps.facebook.com/APP_NAMESPACE/', $permissions);
        echo "<script>window.top.location.href='".$loginUrl."'</script>";
        exit;
    }
} catch(Facebook\Exceptions\FacebookSDKException $e) {
}

try {
    $requestPicture = $fb->get('/me/picture?redirect=false&height=300'); 
    $requestProfile = $fb->get('/me');
    $picture = $requestPicture->getGraphUser();
    $profile = $requestProfile->getGraphUser();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
} catch(Facebook\Exceptions\FacebookSDKException $e) {
}

echo "<img src='".$picture['url']."'/>";
} else {
$helper = $fb->getRedirectLoginHelper();
$loginUrl = $helper->getLoginUrl('https://apps.facebook.com/APP_NAMESPACE/');
echo "<script>window.top.location.href='".$loginUrl."'</script>";
 }

“ composer.json”

 {}

我在Git Bash上使用的命令

heroku create AppName
mkdir AppName
cd AppName
git init
git add .
git commit -m "comment"
heroku git:remote -a AppName
git push heroku master

git branch
git commit -am "comment"
git push heroku master

一切顺利，heroku编译了PHP文件，部署了该文件。但是，当我直接打开Fb应用程序或什至heroku应用程序地址时，它会显示** 403 Forbidden”消息fbapp-2.herokuapp.com

目录结构

Buildpacks设置为heroku / php，
我没有procfile或.htaccess文件

heroku日志显示

State changed from starting to up
2016-04-05T15:30:14.413923+00:00 heroku[router]: at=info method=GET path="/"             host=fbapp-2.herokuapp.com request_id=ea94baf1-a433-4631-bbe5-7493cb7e137f   wd="43.230.135.148" dyno=web.1 connect=0ms service=3ms status=403 bytes=373
2016-04-05T15:30:14.399879+00:00 app[web.1]: [Tue Apr 05 15:30:14.395964 2016] [autoindex:error] [pid 82:tid 139840075028224] [client 1.3.2.3:58066] AH01276: Cannot serve directory /app/: No matching DirectoryIndex (index.php,index.html,index.htm) found, and server-generated directory index forbidden by Options directive
2016-04-05T15:30:14.400023+00:00 app[web.1]: 1.3.2.3 - - [05/Apr/2016:15:30:14 +0000] "GET / HTTP/1.1" 403 209 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36 OPR/36.0.2130.46
2016-04-05T15:30:14.873648+00:00 heroku[router]: at=info method=GET path="/favicon.ico" host=fbapp-2.herokuapp.com request_id=8b65b3b6-2f82-4ab4-abb4-d4849c1ec225 fwd="43.230.135.148" dyno=web.1 connect=0ms service=1ms status=404 bytes=373
2016-04-05T15:30:14.856297+00:00 app[web.1]: 1.3.2.3 - - [05/Apr/2016:15:30:14 +0000] "GET /favicon.ico HTTP/1.1" 404 209 "http://fbapp-2.herokuapp.com/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36 OPR/36.0.2130.46