title: Facebook not showing open graph preview (static html5 on amazon s3)
body: <p>I want to share this link (<a href="https://s3.eu-central-1.amazonaws.com/lavorotrentino/index.html" rel="nofollow noreferrer">https://s3.eu-central-1.amazonaws.com/lavorotrentino/index.html</a>) through a Facebook status.</p>
  
  <p>The problem I'm facing is the missing facebook preview that should be based on the meta tag info in index.html:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html prefix="og: http://ogp.me/ns#" lang="it"&gt;
  
  &lt;head&gt;
  &lt;meta http-equiv="Content-Type" content="text/html charset=utf-8" /&gt;
  &lt;link rel="canonical" href="https://s3.eu-central-1.amazonaws.com/lavorotrentino/index.html" /&gt;
  &lt;link rel="image_src" href="https://s3.eu-central-1.amazonaws.com/lavorotrentino/abc.jpg"/&gt;
  &lt;title&gt;Lavoro in Trentino&lt;/title&gt;
  
  &lt;meta property="og:title" content="Lavoro in Trentino" /&gt;
  &lt;meta property='og:site_name' content='LIT' /&gt; 
  &lt;meta property="og:description" content="Nuove opportunità pubblicate oggi sul portale dell'Agenzia del Lavoro trentina."/&gt;
  &lt;meta property="og:type" content="article" /&gt;
  &lt;meta property="og:url" content="https://s3.eu-central-1.amazonaws.com/lavorotrentino/index.html" /&gt;
  &lt;meta property="og:image" content="http://s3.eu-central-1.amazonaws.com/lavorotrentino/abc.jpg" /&gt;
  &lt;meta property="og:image:secure_url" content="https://s3.eu-central-1.amazonaws.com/lavorotrentino/abc.jpg" /&gt;
  &lt;meta property="og:image:type" content="image/jpeg" /&gt;
  &lt;meta property="og:image:width" content="400" /&gt;
  &lt;meta property="og:image:height" content="400" /&gt;   
  
  &lt;/head&gt;
  </code></pre>
  
  <p>I tried to find the problem with the Open Graph Object Debugger but it seems like the tags are ok: </p>
  
  <p>Facebook Object Debugger result:<br>
  <img src="https://i.stack.imgur.com/P1H1f.png" alt="">.</p>
  
  <p><strong>The message warning</strong>:</p>
  
  <blockquote>
    <p>"<em>fb:app_id hasn't been included in the meta tags. Specify the app ID so that stories shared to Facebook will be properly attributed to the app. Alternatively, app_id can be set in url when open the share dialog. Otherwise, the default app id( 966242223397117 ) will be assigned.</em>"</p>
  </blockquote>
  
  <p><strong>should not be a problem for simply sharing a link.</strong></p>
  
  <p>Are there issues with the amazon s3 free 1 year trial?</p>