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Re:Ruby Koans by mosselman on Thursday April 02, 2015 @08:42AM (#9310282)
Your SSL certificate is invalid:

https://koans.heroku.com/

edit:

this works though:

https://koans.herokuapp.com/en

Re:Ruby Koans by aikah on Thursday April 02, 2015 @11:12AM (#9311139)
I confirm, google complains.

    NET::ERR_CERT_COMMON_NAME_INVALID

    Subject: *.herokuapp.com
    Issuer: DigiCert SHA2 High Assurance Server CA
    Expires on: 19 mai 2017
    Current date: 2 avr. 2015
Re:Ruby Koans by jonaldomo on Thursday April 02, 2015 @10:17AM (#9310823)
heroku charges $20 a month to allow a SSL certificate for a custom domain!
Re:Ruby Koans by nateberkopec on Thursday April 02, 2015 @10:22AM (#9310840)
Just use Cloudflare. It's free.
Re:Ruby Koans by psychometry on Thursday April 02, 2015 @12:15PM (#9311621)
Details: https://robots.thoughtbot.com/set-up-cloudflare-free-ssl-on-...

There are some downsides to this approach that are described there.