Now it will be easier to secure all your subdomains with Let’s Encrypt. They are coming up with Wildcard certificate in this February and it will be free to all and available globally.
Wild card certificate makes https development easier. You don’t need different certificate for each subdomain like shop.example.com, blog.example.com, login.example.com, secure.example.com. With single certificate and a pair of key, you can secure unlimited subdomains (of one domain) easily.
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