Unicorn allows you to specify the maximum number of workers. In development this could be useful if you use a debugger, but do not want to overflow the console with other request like from ActionCable. Then just set the maximum number of workers to 1 and the other requests have to wait.

UNICORN_WORKERS=1 rails server

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

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