40秒后随机得到504 Gateway Time-out答案

【问题标题】：Randomly get 504 Gateway Time-out after 40seconds40秒后随机得到504 Gateway Time-out
【发布时间】：2015-10-26 10:23:25
【问题描述】：

我的服务器正在运行 Apache、FPM/FastCGI 和 PHP 5.5.30。

我有 Laravel 5.0 框架和 Guzzle 来管理不同类型的 HTTP 请求。

在 Guzzle 之前，我使用 Rolling-Curl 并行发出请求。我将 Rolling-Curl 更改为 Guzzle 的原因是我随机出现 504 网关错误，但经过几次测试后，我注意到即使使用 Guzzle 也能得到它。

网关错误总是在 40 秒后发生，而且是随机发生的。如果我按几次 F5（刷新）它就会消失，但以后可能会再次发生。

以下是我的代码 sn-p

$feeds = Feeds::where('active', '=', '1')->lists('url');  

$client = new \GuzzleHttp\Client();

$requests = array();

foreach($feeds AS $feed)
{
  $requests[] = $client->createRequest('GET', $feed);
}

$pool = new Pool($client, $requests, [
  'pool_size' => '5',
  'timeout' => '120',
  'connect_timeout' => '120',
  'complete' => function (CompleteEvent $event) {
    echo 'Completed request to ' . $event->getRequest()->getUrl() . " - ". $event->getResponse()->getStatusCode() . "\n";
    //echo 'Response: ' . $event->getResponse()->getBody() . "\n\n";
  },       
  'error' => function (ErrorEvent $event) {
      echo 'Request failed: ' . $event->getRequest()->getUrl() . "\n";
      echo $event->getException();
  }
]);


$pool->wait();

echo "...done in " . (microtime(true) - $start);
?>

$feeds 正在从数据库中获取 100 个 RSS URL，我的池一次获取最多 5 个提要的内容。

【问题讨论】：

标签： php laravel timeout guzzle gateway

【解决方案1】：

您能否发布您遇到的确切错误，并可能确定您的代码行指示异常被抛出的位置？我认为您可以单独或组合执行两件事来解决错误：

将'rejected' 函数添加到您的池启动选项以处理失败的请求，请参阅Guzzle documentation

如果单独的'rejected' function选项不能修复它，则将您的代码行包装在try {} catch {} block 中

请参阅下面修改的代码以包含我的建议：

$feeds = Feeds::where('active', '=', '1')->lists('url');  

$client = new \GuzzleHttp\Client();

$requests = array();

foreach($feeds AS $feed)
{
    $requests[] = $client->createRequest('GET', $feed);
}

$pool = new Pool($client, $requests, [
  'pool_size' => '5',
  'timeout' => '120',
  'connect_timeout' => '120',
  'complete' => function (CompleteEvent $event) {
    echo 'Completed request to ' . $event->getRequest()->getUrl() . " - ". $event->getResponse()->getStatusCode() . "\n";
    //echo 'Response: ' . $event->getResponse()->getBody() . "\n\n";
  },       
  'error' => function (ErrorEvent $event) {
      echo 'Request failed: ' . $event->getRequest()->getUrl() . "\n";
      echo $event->getException();
   },
   //add the 'rejected' function
   'rejected' => function ($reason, $index) {
       //handle failed requests here
   },
]);

//throw in the try{} catch {} block if the 'rejected' function is not fixing the 504 error
try {
    //your code goes here...I suspect it's the $pool->wait()
    $promise = $pool->promise(); //I included this line from the Guzzle documentation
    $promise->wait();
} catch (ServerException $e) {
    //Catch exception for 504 error here; you probabbly want to retry recursively a number of times before giving up...
}

echo "...done in " . (microtime(true) - $start);

【讨论】：