cannot get http headers in local network

Question

I'm doing a pixel tracking but when I try to get the HTTP Headers using cURL, it returns this:

the current code:

<?php
  $img = imagecreate(1,1);
  $white = imagecolorallocate($img, 255, 255, 255);
  imagesetpixel($img,1,1,$white);
  header("content-type: image/jpg");
  imagejpeg($img);
  imagedestroy($img);
  $file = fopen("results.txt", "a");
  $ip = $_SERVER['REMOTE_ADDR'];
  $date = date("r");
  fwrite($file, "$ip from: $_SERVER['HTTP_REFERER'] at $date");
  fclose($file);
?>

Answer 1

1. First of all add line i records.txt
2. Generate Image
3. Do ob_clean(), it will remove output if warning occures
4. Give output of image
5. do not close php tag.
6. try it with browser instead of CURL because curl output should be garbase collection because output is in binary format.

PHP:

<?php

  $file = fopen("results.txt", "a");
  $ip = $_SERVER['REMOTE_ADDR'];
  $date = date("r");
  fwrite($file, "$ip from: $_SERVER['HTTP_REFERER'] at $date");
  fclose($file);
  $img = imagecreate(1,1);
  $white = imagecolorallocate($img, 255, 255, 255);
  imagesetpixel($img,1,1,$white);
  header("content-type: image/jpg");
  ob_clean();
  imagejpeg($img);
  imagedestroy($img);