Rails: Puma MiniSSL::SSLError

The problem

When setting up a dev environment for older Rails projects, Puma can sometimes have trouble serving https:// pages. Puma boots ok but will begin choking with a MiniSSL::SSLError:

➜ bundle exec rails s -b "ssl://0.0.0.0:3000?key=config/ssl.key&cert=config/ssl.crt"
=> Booting Puma
=> Rails 6.0.4.1 application starting in development

2022-03-03 17:19:21 +1100: SSL error, peer: 127.0.0.1, peer cert: , # <Puma::MiniSSL::SSLError: OpenSSL error: error:141F7065:SSL routines:final_key_share:no suitable key share - 337604709>

The fix

This error is caused by a bug in older versions of Puma. To fix, simply update the version of Puma in the Rails gemfile:

/Gemfile
#gem 'puma', '~> 3.11'
gem 'puma', '~> 4.3.8'

Then install the new version of the Puma gem and test:

➜ bundle install
➜ bundle exec rails s -b "ssl://0.0.0.0:3000?key=config/ssl.key&cert=config/ssl.crt"
=> Booting Puma
=> Rails 6.0.4.1 application starting in development

Puma should now run and serve https pages successfully.

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