title: app.yaml file mistake : Call to undefined function curl_init()
body: <p>I can't find the simple mistake in my app.yaml file.,,
  I am a new in python and google app engine ,,,
  when i run or deploy it works and css folder work ,but when I click to send post to getvideo.php ,, I think it is a problem in definition of curl.php Because it gives me :-</p>
  
  <p>Fatal error: Call to undefined function curl_init() in C:\Users-----\Desktop\YTD\curl.php on line 9</p>
  
  <p>this my app.yaml</p>
  
  <pre><code>application: isdarat-is
  version: 2
  runtime: php
  api_version: 1
  
  
  handlers:
  - url: /
    script: index.php
  
  - url: /config.php
    script: config.php
  
  - url: /curl.php
    script: curl.php
  
  - url: /download.php
    script: download.php
  
  - url: /getimage.php
    script: getimage.php
  
  - url: /getvideo.php
    script: getvideo.php
  
  - url: /ytdl.user.js
    script: ytdl.user.js
  
  - url: /css/
    static_dir: css
  </code></pre>
  
  <p>and this is php script source <a href="https://github.com/jeckman/YouTube-Downloader" rel="nofollow">https://github.com/jeckman/YouTube-Downloader</a></p>