Why are my URLs messed up by Facebook?

Question

The link to certain pages on a site I've written looks like this:

http://myhymnal.net/2/be-thou-my-vision

That would be the id and a slug. When I paste this URL into the Facebook post field, the URL it ends up fetching an "example" of is the following:

http://myhymnal.net/2/2/be-thou-my-vision

Could anyone help me figure out where that extra 2/ comes from? I don't understand it.

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Findings

• The URL I paste in is http://myhymnal.net/2/be-thou-my-vision and works fine in the browser.
• The base href is set to http://myhymnal.net/ and I have set the canonical to 2/be-thou-my-vision, which is relative to the base URL and should work fine. Although I suppose this maybe could be what's messing it up?

Other than that I really have no clue... :(

Answer 1

Look at Facebook's Debug Tool - you're setting the canonical URL relative to the current directory, not the site root - facebook is then fetching http://myhymnal.net/2/2/be-thou-my-vision

Use a fully qualified URL for the canonical URL