title: How to get metadata when posting link to PDF on facebook?
body: <p>So far in my research it appears that facebooks crawler doesn't support PDF files.
  When sharing a link to a PDF file, no metadata is available.
  This is apparent in the <a href="https://developers.facebook.com/tools/debug/og/object/" rel="nofollow noreferrer">Open Graph Object Debugger</a>
  Setting the metadata in the PDF file has no affect. </p>
  
  <p>Is there any way to get around this?</p>