问题
This is the page: https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fmacondo.tw%2F%23%21%2Fbook%2F50fa1589425b0dc41a000002.
I got the warning "og:url tag in the header is not the same URL as rel='canonical' link in the html". However, "See exactly what our scraper sees for your URL" showed that they are the same.
来源：https://stackoverflow.com/questions/15000549/ogurl-tag-in-the-header-is-not-the-same-url-as-rel-canonical-link-in-the-html