Facebook crawler is hitting my server hard and ignoring directives. Accessing same resources multiple times

Question

The Facebook Crawler is hitting my servers multiple times every second and it seems to be ignoring both the Expires header and the og:ttl property.

In some cases, it is

Answer 1

@Nico suggests

We had same problems on our website/server. The problem was the og:url metatag. After removing it, the problem was solved for most facebookexternalhit calls.

So you could try removing that and see if it fixes the problem