All the debugging steps you need are in the pinned post.
I just tried the http:// version vs https:// using
curl - the latter is successful, the former fails.
$ curl -L -v -A Twitterbot http://fb.me/3496PPgbo * Trying 18.104.22.168... * TCP_NODELAY set * Connected to fb.me (22.214.171.124) port 80 (#0) > GET /3496PPgbo HTTP/1.1 > Host: fb.me > User-Agent: Twitterbot > Accept: */* > < HTTP/1.1 400 Bad Request < Content-Type: text/html < X-FB-Debug: v8z+GoK/WQceIlC4UKxTSi1ui0/7J8xy2ny65uBTsOXel/pgvXCsNaXHQpR9qdHdZcot4soVy9rJDdbPqqW8tQ== < Date: Fri, 05 May 2017 11:33:40 GMT < Connection: keep-alive < Content-Length: 0 < * Curl_http_done: called premature == 0 * Connection #0 to host fb.me left intact
It is not clear whether that’s a permanent change to that URL shortener to require or prefer https:// links, but either way this is not something that we can resolve on our side.
Should I contact Facebook? Those links are generated from ‘Link Your Pages to Twitter’ by Facebook
I guess that’s your best bet, since we can’t change the way their server responds.
Thanks for the Help.
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