Earlier this evening, I received an automated e-mail from Twitter, stating, “Your [sic] submitted a request for http://www.maharaj.org/ to be included in Twitter Cards. Unfortunately we determined that your application was incomplete and needs to be resubmitted,” and suggesting that I try the preview tool at https://dev.twitter.com/docs/cards/preview
When I use the preview tool, with http://www.maharaj.org/blog/2012_08_08.shtml as the “media URL”, I keep receiving the error
* Our fetcher fails to fetch image at URL http://www.maharaj.org/images/twtcet.png.
* HTTP response code: 406.
despite the fact that the image at that URL comes up in my browser without issues. The image is also well within the 120x120px and 60x60px requirements.
Stranger still, if I remove the valid http://www.maharaj.org/images/twtcet.png URL from my meta tags and replace it with an invalid URL (ie a URL leading to an image that does not exist), the preview tool successfully generates a card (ie there is no error message as above), except that there is a tiny “404” message in the image square.
Am I doing something wrong, or is there some sort of error in the preview tool?