I host a website on Azure (Web App), but in front of it there is a reverse proxy server (Win Server 2012R2, IIS 8, ARR 3) to route /blog requests to another server.

If I try to share an url (example.com), there is no preview. But if I share original url (site.azurewebsites.net), preview works fine! Reverse proxy configuration is default one, latest ARR addon with one rule, routes to server farm with one server. I do not block anything, just rewrite all request to site.azurewebsites.net. IIS logs looks ok, Facebook bot receives response status 200.

Also, in facebook debug tool (https://developers.facebook.com/tools/debug/og/object/) all tags and HTML are read correctly, but there is no preview on the bottom.

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