When posting https://www.lovetoknowindia.com/Assam/top-five-places-to-visit-in-assam-india/2412 URL on FaceBook page the title of the post was appearing as 404 file not found. This is how we solved it.
Use Facebook debugger tool https://developers.facebook.com/tools/debug/ tool to see how Facebook post will appear. We get to know that the og:url value was having incorrect URL which doesn’t exists on server. So either correct value of this tag or remove it. It will resolve the issue.
