curl_exec not working with Veeva Vault integration into CakePHP

I have a site written in CakePHP which needs to download files from Veeva Vault. I inherited this authentication function from someone else which is supposed to return a session id from Veeva, but it returns false on curl_exec() when it should return true. I was told the function worked with a test file outside CakePHP so I'm thinking its something Cake related.

private function Auth()  {      try {        $url = self::VVURL . '/auth?username=' . self::VVUSERNAME . '&password=' . self::VVPASS;        $curl = curl_init($url);        curl_setopt($curl, CURLOPT_HEADER, false);      curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);      curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json;charset=UTF-8"));      curl_setopt($curl, CURLOPT_POST, true);      curl_setopt($curl, CURLOPT_POSTFIELDS, null);      curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);        $json_response = curl_exec($curl);        if ($json_response != true) {          throw new Exception (curl_error($curl), curl_errno($curl));      }      $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);        if($status != 200)      {        die('Error:  call to URL $url failed with status "' . $status .'", response "' . $json_response. '", curl_error "' . curl_error($curl) . '", curl_errno "'  . curl_errno($curl). '"');      }      else       {        //Enable following line to DEBUG        //print_r($json_response);      }        curl_close($curl);        $return = json_decode($json_response);      foreach($return as $k => $v)      {        if($k == 'sessionId')          $this->sessID = $v;      }        return $this->sessID;        }      catch(Exception $e){          trigger_error(sprintf(          'Curl failed with error #%d: %s',          $e->getCode(), $e->getMessage()),          E_USER_ERROR);      }  }

curl_init($url) returns resource(148, curl) . I don't know if that's right or not.

curl_getinfo($curl, CURLINFO_HTTP_CODE) returns 200, so I know that's good.

curl_exec($curl) returns false.

The catch returned:

Fatal Error Error: Curl failed with error #56: Problem (2) in the Chunked-Encoded data
File: C:\wamp\www\content\app\Vendor\veeva\veeva.php
Line: 109 Notice: If you want to customize this error message, create app\View\Errors\fatal_error.ctp

Unfortunately I can't seem to find any helpful Veeva documentation.

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