Facebook 'Like' button breaks https/SSL

Question

On an e-commerce website I maintain, I added a Facebook 'Like' button per the instructions here:

http://developers.facebook.com/docs/reference/plugins/like

I am using the iframe method:

<iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fexample.com%2Fpage%2Fto%2Flike&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=80" 
  scrolling="no" frameborder="0" style="border:none; overflow:hidden; 
   width:450px; height:80px;" allowTransparency="true">
</iframe>

It works, but if a customer happens to be logged into her account, she gets the infamous "mixed content warning"

Is there a way to use the same Facebook 'Like' button code but in a way that will not interject non-https content when in SSL mode?

Answer 1

You can avoid SSL warnings for domains that support SSL by not being specific about the transport protocol. e.g. instead of including http:// or https://, use //.

instead of

<iframe src="http://www.facebook.com/plugins/like.php?href=http%3A%2F%2Fexample.com%2Fpage%2Fto%2Flike&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"></iframe>

use

<iframe src="//www.facebook.com/plugins/like.php?href=http%3A%2F%2Fexample.com%2Fpage%2Fto%2Flike&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"></iframe>

Answer 2

Here is a hint, facebook.com supports SSL ;)