得到错误＆＃34; redirect_uri URL必须是绝对的＆＃34;在FB Canvas应用程序中，即使我已经硬编码了绝对的Canvas URI

Question

我看过很多帖子都会遇到同样的错误，我尝试了很多应用设置和代码的组合。我在下面发布了我的应用设置和PHP代码。我对FB集成和PHP都很陌生，所以我可能会做一些明显愚蠢的事情。请帮忙告诉我它是什么！

FacebookSession::setDefaultApplication('*myappid*','*myappsecret*');
  /**
   * Returns the JSON encoded POST data, if any, as an object.
   * @return Object|null
   */
// get the raw POST data
$rawData = file_get_contents("php://input");
// this returns null if not valid json
$JSONSignedRequest = parse_signed_request($rawData);
$SignedRequestArray = json_decode($JSONSignedRequest);
if($SignedRequestArray["oauth_token"]) { 
    echo 'You are already signed in!';
}
else {
    if(isset($facebookLoginHtml)){ 
        echo '<script language="javascript">'; 
        echo "top.location.href='https://www.facebook.com/dialog/oauth?client_id=

{*myappID*}&redirect_uri={https://apps.facebook.com/myappnamespace/}&scope=publish_actions,
public_profile,user_friends,user_relationships,read_stream,publish_actions';"; 

        echo '</script>';        
    }
}

function parse_signed_request($signed_request) {
  list($encoded_sig, $payload) = explode('.', $signed_request, 2); 

  $secret = "*myappsecret*"; // Use your app secret here

  // decode the data
  $sig = base64_url_decode($encoded_sig);
  $data = json_decode(base64_url_decode($payload), true);

  // confirm the signature
  $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true);
  if ($sig !== $expected_sig) {
    error_log('Bad Signed JSON signature!');
     return null;
  }

  return $data;
}

function base64_url_decode($input) {
  return base64_decode(strtr($input, '-_', '+/'));
}

StackOverflow不允许我将我的设置发布为图片或链接。大多数设置都是链接，所以我会尝试添加注释。