Facebook - URL returned a bad HTTP response code

The error is quite strange. The only thing that comes in my mind is that you apparantly use an incomplete url in the

<meta property="og:url" content="http://www.mymoviematch.com" />

tag. I think it should match the full URL.

I got the same problem and solved it by changing my DNS settings. Facebook uses IP V6 so you need to specify correct IP V6 in your AAAA record (not only IP V4).

I had a rule in my apache mod security in the way. Temporarily deactivating it helped me. An IPv6 record is not required. I have only IPv4 and it works.