Hot answers tagged canonical-url
I think this is a good way to solve this problem. I read something similar yesterday at moz.com Q&A Section (actually i thought it was the exactly same question as here) and it says cannonicalisation quite like 301 redirects in that case. You better read that yourself.
I'd go with the canonical header. The purpose of it would be to tell search engines the preferred URL where the content should be indexed (so you can reap the benefit of any traffic those images send your way). Where the content should be indexed is not the same (in this case) as where it is served from and a canonical header seems like the appropriate way ...
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