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Almost. SNI slots are free - Yes, but still you have to buy the SSL certificate from somewhere (cheapest are something like $8/year - https://www.ssls.com)

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And since SNI isn't legacy-compatible, Google itself recommends to "detect browsers that do not support SNI and recommend a browser that supports it"

https://developers.google.com/appengine/docs/ssl#server_name...

If you can use any CA, you can get a free certificate from StartSSL https://startssl.com/

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