vixip/www/artwork.php

<?php
  require_once("../config.php");
  $id = (int)$_GET["illust_id"];

  header("Content-type: image/jpg");

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, "https://embed.pixiv.net/artwork.php?illust_id=".$id);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  curl_exec($ch);
  curl_close($ch);
?>