We are trying to get Twitter Cards rendered for some content on our site by dynamically create a public page for that content an opening an Intent with the url in its body. The generated page its a blank page wich only renders meta tags in
<header> so from browsers you only see blank.
Problem is that it isn’t working neither on Cards Validator (Unable to render Card preview. Log: ERROR: Fetching the page failed because the request timed out.) or when trying to post a Tweet with that url. But the page can be accessed normaly from the browser.
The card Type is summary_large_image. The url contains Port number (http://mysite.com:8080/rest/of/link), could this be the problem?