已验证Google WebSub订阅，上传YouTube视频后无通知求助

我有一个测试YouTube频道，搭建了WebSub钩子，目的是在频道上传视频时，触发PHP脚本向Telegram机器人发送数据。对应的index.php代码如下：

file_put_contents(__DIR__.'/debug.php',"<?php die(); /*\n".$_SERVER['REQUEST_METHOD']."\n*/",FILE_APPEND);

// Bootstrap Sentry
require_once "./lib/sentry.php";
\Sentry\captureMessage("Request ".$_SERVER['REQUEST_METHOD'],\Sentry\Severity::info());

// Sentry also requires Settings as well therefore we use require
$settings = require("./config.php");

$traceId = rand();

if(!isset($settings['YT_CHANNEL_ID'])){
  http_response_code(500);
  \Sentry\captureMessage("$traceId : No youtube channel Id has been Configured",\Sentry\Severity::error());
  exit(0);
}

// Hub sends a GET request for subscription Then a post methos is
if($_SERVER['REQUEST_METHOD'] == "GET"){

  if(!isset($_GET['hub_mode']) || $_GET['hub_mode']!=='subscribe'){
    http_response_code(204);
    exit(0);
  }

  if(!isset($_GET['hub_topic'])){
    http_response_code(400);
    \Sentry\captureMessage("$traceId : Topic has not been provided",\Sentry\Severity::error());
    exit(0);
  }

  $expected_topic = "https://www.youtube.com/feeds/videos.xml?channel_id=".$settings['YT_CHANNEL_ID'];
  if($expected_topic!=trim($_GET['hub_topic'])){
    http_response_code(403);
    \Sentry\captureMessage("$traceId : Googlwe websub provided wrong channel id",\Sentry\Severity::error());
    exit(0);
  }

  if(!isset($_GET['hub_challenge'])){
    http_response_code(400);
    exit(0);
  }

  http_response_code(200);
  header("Content-Type: text/plain");
  echo $_GET['hub_challenge'];
  \Sentry\captureMessage("Hub Is Subscribed",\Sentry\Severity::info());
  exit(0);
}

// Post handling begins here

$string = file_get_contents('php://input');
\Sentry\captureMessage("BODY:\n".$string,\Sentry\Severity::info());
file_put_contents(__DIR__.'/debug.php',PHP_EOL."/*".$string."*/",FILE_APPEND);


require_once "./lib/requestHandler.php";

if(empty($string)){
  http_response_code(400);
  \Sentry\captureMessage("$traceId : Input is empty",\Sentry\Severity::error());
  exit(0);
}


try{
  $ytInfo = parseRequest($string);

  if($ytInfo->channelId != $settings['YT_CHANNEL_ID']){
    // Despite input is valid we no need to send message for a channel that we have not confirued to do so.
    http_response_code(204);
    \Sentry\captureMessage("Channel Missmatch Skipping",\Sentry\Severity::info());
    exit(0);
  }

} catch(\InvalidArgumentException $e){
  http_response_code(400);
  \Sentry\captureException($e);
  exit(0);
}

require_once "./lib/bot_actions.php";

try{
  sendMessageToChannel($settings['TELEGRAM_CHANNEL_ID'],$settings['BOT_TOKEN'],$ytInfo->videoUrl,$ytInfo->videoTitle);
  http_response_code(204);
}catch(\Exception $e){
  \Sentry\captureException($e);
  http_response_code(500);
}

订阅已经验证通过，但向频道上传视频后，WebSub并未调用该脚本。

为排查问题，我简化了脚本：

// Hub sends a GET request for subscription Then a post methos is
if($_SERVER['REQUEST_METHOD'] == "GET"){

  if(!isset($_GET['hub_challenge'])){
    http_response_code(400);
    exit(0);
  }

  http_response_code(200);
  header("Content-Type: text/plain");
  echo $_GET['hub_challenge'];
  exit(0);
}

// Post handling begins here

$string = file_get_contents('php://input');
file_put_contents(__DIR__.'/debug.txt',PHP_EOL.$string,FILE_APPEND);

http_response_code(204);

重新订阅频道后，debug.txt始终没有内容，pubsubhubbub仍未调用新脚本。这是已知问题吗？该如何解决？

• 检查回调URL的可访问性：确保回调URL是公网可访问的，且使用HTTPS（YouTube要求WebSub回调必须用HTTPS，本地测试除外），路径没有拼写错误。
• 验证视频状态：上传的视频必须是公开可见的，私有或未列出的视频不会触发通知；同时要等视频完成转码、审核流程，这个过程可能需要几分钟。
• 排查服务器拦截规则：检查服务器防火墙、安全组，以及CDN/WAF是否拦截了YouTube的POST请求；查看服务器访问日志，确认是否有来自YouTube的请求到达。
• 重新确认订阅参数：发起订阅时，确保hub.topic是正确的频道Feed地址，且hub.lease_seconds设置合理，避免租期到期未续约导致通知中断。
• 优化脚本调试：给简化版脚本添加更详细的日志，比如记录请求时间、请求头，同时确保脚本所在目录有PHP进程的写入权限：

  // 在POST处理部分添加
  $logData = date('Y-m-d H:i:s') . " - 请求已接收\n";
  $logData .= "请求头:\n" . print_r(getallheaders(), true) . "\n";
  $logData .= "请求体:\n" . $string . "\n\n";
  file_put_contents(__DIR__.'/debug.txt', $logData, FILE_APPEND);
  

• 检查服务状态：查看YouTube开发者状态页面，确认WebSub服务是否存在故障或维护。

内容的提问来源于stack exchange，提问作者Dimitrios Desyllas