We are running a webshop and Google should index it on the normal HTTP pages.

But because there is also a "Facebook app" in front of the same shop, and a fb app requires https, all pages are reachable on HTTPS also.

The question is, if I add a <link rel="canonical" href="http://example.com/thesame-page"> to all HTTPS pages, will this be ok for Facebook? (This link tag would be needed to avoid google seeing duplicate content iin our shop)

But this is a Facebook app question. Will Facebook just happily ignore it?

  • Should be because nothing is retrieved when using <link rel="canonical">. Canonical links work by informing search engines preferred pages and when users view a page with a canonical link nothing again is retrieved as its for search bots ;) Jun 27, 2014 at 18:26
  • as in received, link canonical is information for search engines not a resource like a image, sound file or similar. Jun 28, 2014 at 11:54

2 Answers 2


As Facebook are not a website search engine, it is unlikely they need to use that tag for anything. A search on Facebook's help centre for "canonical" certainly returns no results.

Pretty sure they will just ignore it.

  • thank you. feel voted up. i have not enough "reputation" for actually doing it.
    – SHernandez
    Jul 30, 2014 at 20:14

One of my sites has all the canonical URLs pointing to the HTTP site, but the Facebook app available over HTTPS. This appears to cause no problems for Facebook.


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