title: Facebook sharing image (og:image) not working the first time despite having og:image:width and og:image:height
body: <p>I'm building an image on the fly to attach to page to be shared on facebook. Everything seems to be going great until it hits the share dialog. Facebook doesn't seem to be scraping, because the image isn't showing up. If I refresh that dialog page, it does load the image (having crawled it from the first go?). </p>
  
  <p>I've read several pages that say I need only specify <em>og:image:width</em> and <em>og:image:height</em> to allow for immediate rendering, but that doesn’t seem to be working. Here are my meta tags:</p>
  
  <pre><code>&lt;meta property="fb:app_id" content="###"/&gt;
  &lt;meta property="og:type" content="website" /&gt;
  &lt;meta property="og:url" content="###" /&gt;
  &lt;meta property="og:title" content="My Page Title" /&gt;
  &lt;meta property="og:description" content="My Page Description" /&gt;
  &lt;meta property="og:image" content="http://the-domain/the-image.jpg" /&gt;
  &lt;meta property="og:image:width" content="1200" /&gt;
  &lt;meta property="og:image:height" content="630" /&gt;
  &lt;meta property="og:image:type" content="image/jpeg" /&gt;
  </code></pre>
  
  <p>Am I missing something here?</p>