php cURL提供空白响应体

我在下面的cURL请求中得到了一个空白的响应体，但只在一台机器上（osx运行两个vagrant box）。我已经检查并重新检查了项目代码，它确实在我使用过的所有其他机器上工作。。除了一个。有什么想法吗

我在PHP中的调用是

POSTRequestTrusted（/api/login，

输出：

HTTP\\/1.1 200 OK\\r\\n日期：周二，2014年6月24日22:41:46 GMT\\r\\n服务器：Apache\\/2.4.9（Ubuntu）\\r\\nX由以下驱动：PHP\\/5.5.13-2+deb.sury.org~precise+1\\r\\n缓存控制：无存储\\r\\n标签：无缓存\\r\\n内容长度：174 r\\n内容类型：应用程序\\/json“，null

返回值 返回在适当PHP类型的json中编码的值。值true、false和null分别作为true、false和null返回。如果json无法解码或编码的数据深度超过递归限制，则返回null。

---

你应该检查返回的正文实际上是什么，因为它没有正确解码。你得到的内容长度标题说你应该有174字节的内容。

我会调查一下，但是我想知道为什么我的请求在其他机器上工作。它们都是通过Vagrant运行的。json_解码的行为不同租来的..尽管我已经把系统从vagrant中弄出来..这很奇怪，原来是BOM，我需要在运行JSON_解码之前去掉它。。。

public static function POSTRequestTrusted($service_name, $data) {

  self::checkApiKey(); //checks the key is set

  return self::execCURLRequest("POST", $service_name, array('Content-Type: application/json',
          'Accept: application/json',
          'Authorization: Basic ' . self::$apiKey )
      , $data);
}

public static function execCURLRequest($type, $service_name = null, $custom_headers = null, $data = null) {

  //If the verb is unexpected, throw exception
  if($type !== "GET"
      and $type!== "POST"
      and $type!== "DELETE"
      and $type!== "PUT"
      and $type!== "PATCH" ) 
    { return -1 ;}

  //If calling a service, or just pinging the base hostname:port
  if($service_name !== null) {
    $full_url = self::$apiBase . $service_name;
  } else {
    $full_url = self::$apiBase;
  }

  // initialize cURL
  $ch = curl_init($full_url);

  // SET the HTTP VERB type, unless it's a POST which doesn't require anything
  if($type == 'PUT' or $type == 'DELETE' or $type == 'PATCH'){
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $type);
  } else if ($type == 'GET'){
    curl_setopt($ch, CURLOPT_HTTPGET, true);
  }
  //Flag needed to return response
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

  // custom headers are needed for testing trusted client calls.
  if($custom_headers !== null){
    $full_header = $custom_headers;
  } else {
    $full_header = self::$STD_HEADER;
  }

  curl_setopt($ch, CURLOPT_HTTPHEADER, $full_header); //Set the Header
  curl_setopt($ch, CURLOPT_HEADER, 1); // return headers?

  // If data was present, encode it and append to request
  if($data !== null){
    $json_data = json_encode($data);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
  }

  $response = curl_exec ($ch);

  // parse the entire response, down to the header and body
  list($response_header, $body) = explode("\r\n\r\n", $response, 2);

  $response_body = json_decode($body);

  curl_close ($ch);

  return array($response_header, $response_body); 

  $response_body = json_decode($body);

  curl_close ($ch);

  return array($response_header, $response_body);