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Asked: 2026-05-20T08:37:44+00:00

I am using Ruby on Rails 3 and I would like to know some

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I am using Ruby on Rails 3 and I would like to know some information in order to buy SSL certificates.

I have a RoR application at this URL

pjtnam.com

and another RoR application at this URL

users.pjtname.com

If I make an HTTPS request from the application pjtname.com to the application users.pjtname.com like this (in this example I use the Typhoeus gem)

Typhoeus::Request.get(https://users.pjtname.com/sign_in)

and I must receive the response over HTTPS protocoll, how many SSL certificates I must buy?

UPDATE

How many SSL certificates I must buy if

  1. my pjtname.com and users.pjtname.com applications are located on different server?

  2. my applications are pjtname1.com and pjtname2.com and they are located on different server?

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1 Answer

  1. Editorial Team

    If done properly, just one; a wildcard certificate for ‘*.pjtname.com’ and ‘pjtname.com’ (it’s possible to include more than one name in a single certificate).

    While you could instead get a certificate for ‘pjtname.com’ and ‘users.pjtname.com’, such a certificate would no longer be sufficient when you later decide you need a ‘mail.pjtname.com’ or a ‘chat.pjtname.com’ or whatever. The wildcard would cover these future cases.

    re: update

    1. It doesn’t matter if services are located on different servers; just put the certificate on both servers.

    2. It’s possible to have both ‘foo.com’ and ‘bar.com’ in a single certificate, just like you can have both ‘pjtname.com’ and ‘users.pjtname.com’. However, it might more difficult to acquire the foo/bar certificate than the pjtname.com/users.pjtname.com.

    Also, these answers are true regardless of platform.

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