How can I move a URL via 301 redirect and retain the page's Facebook likes and Open Graph information?

问题

I understand the og:url meta tag is the canonical url for the resource in the open graph.

What strategies can I use if I wish to support 301 redirecting of the resource, while preserving its place in the open graph? I don\'t want to lose my likes because i\'ve changed the URLs.

Is the best way to do this to store the original url of the content, and refer to that? Are there any other strategies for dealing with this?

To clarify - I have page:

/page1, with an og:url of http://www.example.com/page1

I now want to move it to /page2, using a 301 redirect to http://www.example.com/page2

Do I have any options to avoid losing the likes and comments other than setting the og:url meta to /page1?

回答1:

Short answer, you can't.

Once the object has been created on Facebook's side its URL in Facebook's graph is fixed - the Likes and Comments are associated with that URL and object; you need that URL to be accessible by Facebook's crawler in order to maintain that object in the future. (note that the object becoming inaccessible doesn't necessarily remove it from Facebook, but effectively you'd be starting over)

What I usually recommend here is (with examples http://www.example.com/oldurl and http://www.example.com/newurl):

• On /newpage, keep the og:url tag pointing to /oldurl
• Add a HTTP 301 redirect from /oldurl to /newurl
  • Exempt the Facebook crawler from this redirect
  • Continue to serve the meta tags for the page on http://www.example.com/oldurl if the request comes from the Facebook crawler.
  • No need to return any actual content to the crawler, just a simple HTML page with the appropriate tags

Thus:

1. Existing instances of the object on Facebook will, when clicked, bring users to the correct (new) page via your redirect
2. The Like button on the (new) page will still produce a like of the correct object (but at the old URL)

If you're moving a lot of URLs around or completely rewriting your URL scheme you should use the new URLs for new articles/products/etc, but you'll need to keep the redirect in place if you want to retain likes, comments, etc on the older content.

This includes if you're changing domain.

The only problem here is maintaining the old URL -> new URL mapping somewhere in your code, but it's not technically difficult, just an additional thing to maintain in the future.

BTW, The Facebook crawler UA is currently facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)

回答2:

I'm having the same problem with my old sites. Domains are changing, admins want to change urls for seo etc

I came to conclusion its best to have some sort uniqe id in db just for facebook - from the beginning. For articles for example I have myurl.com/a/123 where 123 is ID of the article.

Real url is myurl.com/category/article-title. Article can then be put in different category, renamed etc with extensive logic for 301 redirects behind it. But the basic fb identifier can stay the same for ever.

Of course this is viable only when starting with a fresh site or when implementing fb comments for the first time.

Just an idea if you can plan ahead :) Let me know what you think.

来源：https://stackoverflow.com/questions/7197919/how-can-i-move-a-url-via-301-redirect-and-retain-the-pages-facebook-likes-and-o