title: The twitter image is not displaying, robot.txt allowed access to images folder
body: <p>Hi twitter card is not showing up the image , when tested in twitter card validator i got an warning message like this "specified by the 'twitter:image' metatag may be restricted by the site's robots.txt file, which will prevent Twitter from fetching it."  The image is 600X300 and is accessibly through browser.</p>
  
  <p>I have specified the following meta tags
  twitter:card
  twitter:site
  twitter:creator
  twitter:title
  twitter:url
  twitter:imag</p>