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Re:Github SSL replaced by self-signed certificate in China by ivanr on Sunday January 27, 2013 @06:30PM (#5126177)
I maintain a complete guide to SSL/TLS deployment:

SSL/TLS Deployment Best Practices https://www.ssllabs.com/projects/best-practices/

Re:Github SSL replaced by self-signed certificate in China by hnolable on Sunday January 27, 2013 @08:07PM (#5126507)
You may want to integrate some of the advice from here in your HSTS section:

http://coderrr.wordpress.com/2010/12/27/canonical-redirect-p...

It seems even github is susceptible to this. That is, for people who type www.github.com into their browser rather than github.com. They both did the redirect wrong, as well as left off HSTS of https://www.github.com.