This is my html:
<html>
<head>
<meta property="og:title" content="This is my title" />
<meta property="og:description" content="This is my content" />
</head>
<body>
test
</body>
</html>Now the facebook-debug-tool tells me that 'og:title' of type 'string' is not provided. Clicking on "See exactly what our scraper sees" returns a blank page. The "test" within the body is not displayed. I have already disabled gzip content type as it was proposed in another answer...
The problem was that I had ReWrite-Rules in place that were originally targeted at the google-crawler. Long story short: The facebook-crawler got hooked by those Rewrite-Rules, too. After removing the rewrite rules everything worked like a chram.