"Invalid Card Type" when "twitter:card" is "summary"


When I validate Twitter cards for my personal blog (http://www.burgers.io/7), I get an error “Invalid card type.” Since my card type is “summary”, I do not know what else to check to get my card to validate.


Sorry, we’ve been having intermittent issues with the validator. It looks like you eventually submitted and are on your way.

Let us know if we can help otherwise!


The issue was that the server wasn’t returning a ‘Content-Type’ header. It would be helpful if the error message was more explicit.

When I see, “Invalid card type,” I assume that the parser was able to parse out the card type, when in reality the parser was unable to parse the page at all. An error message like, “Unable to parse meta tags” would be much more helpful.