Sturminator10 on "[Plugin: Jetpack by WordPress.com] Photon images not showing canonical URL"

I've been reading that images served by Photon are supposed to include a canonical URL.

That's correct. Jetpack's Photon module, much like other good image CDNs out there, include a canonical URL, as recommended by search engines.

You can check this by querying one of your Photon images with cURL, like so:

$ curl -I https://i1.wp.com/edwardsturm.com/wp-content/uploads/2016/02/How-to-Make-a-Viral-Video-15-Simple-Ways-to-Haess-a-Viral-Trend.png
HTTP/1.1 200 OK
Server: nginx
Date: Tue, 12 Jul 2016 15:09:58 GMT
Content-Type: image/png
Content-Length: 1385220
Connection: keep-alive
Last-Modified: Tue, 12 Jul 2016 15:09:38 GMT
Expires: Fri, 13 Jul 2018 03:09:38 GMT
Cache-Control: public, max-age=63115200
Link: <http://edwardsturm.com/wp-content/uploads/2016/02/How-to-Make-a-Viral-Video-15-Simple-Ways-to-Haess-a-Viral-Trend.png>; rel="canonical"
X-Content-Type-Options: nosniff
ETag: "18c2a6e298505173"
X-Bytes-Saved: 843148
Vary: Accept
X-nc: HIT vie 20

As you can see, the canonical link is there.

This canonical link is common practice for Image CDNs; it's implemented in KeyCDN as well as MaxCDN for example.

As recommended in those posts, as well as on this Moz community thread, you will also want to make sure your wp-content/ directory can be indexed by Google; having the canonical link redirecting search engines to the original images will be fairly useless otherwise.

I hope this helps.

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