HTTPS and external (CDN) hosted files?

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Assuming the CDN provider has an https version, you can use protocol-relative URLs.

For example, instead of:

http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js

…you can use:

//ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js

The browser will use the page’s protocol to try to obtain the file. On non-secure pages, http. On secure pages, https.

Google also makes YUI Loader available through its CDN. So for YUI this works fine:

//ajax.googleapis.com/ajax/libs/yui/2.8.0/build/yuiloader/yuiloader-min.js

…in both http and https contexts.

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