We’ve been using summary card for a long time with no problem, but we think that summary_large_image will do better for our tweets.
We’ve configured all needed meta-tags and finally spotted that when we use CDN URL for twitter:image, image proxy server returns an error (watching network traffic on Chrome Dev Tools, this should be visible on card test page)
On CDN we have whitelisted
and in our robots.txt we’ve added
What else could be happening? We use max-cdn.
Example Card page:
Example image URL:
We do not use SSL on our website so I think reported SNI problem is not the case.
Hope we can get some light into this. Thanks!