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Update, January 2016: This guide is seriously out of date. Don't use StartSSL anymore, and don't jump through all these hoops below. Instead, check out either of three great options: 1) SSLMate issues single-domain certificates for $16/year. While it's more than $0, it's more than worth it to be able to run sslmate buy mywebsite.com and have it Just Work. If you use SSLMate, this guide will still
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