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The Google charts API doesn't provide an SSL interface - if you use it on a page served over https, you'll get a mixed content warning.

[EDIT] I was mistaken, see andrewjshults's reply.

The google charts link at the top of the thread (http://news.ycombinator.com/item?id=2419367) https://chart.googleapis.com/chart?chs=150x150&cht=qr... is served via HTTPS. Their docs don't officially acknowledge supporting HTTPS but it looks like people have been doing it since 2007 (at least - http://groups.google.com/group/google-chart-api/browse_threa... )

Interesting - looks like chart.googleapis.com works over HTTPS: https://chart.googleapis.com/chart?chs=150x150&cht=qr...

but chart.apis.google.com (which Google formerly used) does not: https://chart.apis.google.com/chart?chs=150x150&cht=qr&#...

Turns out I was looking at some outdated docs. Thanks!