If your rails app running on a special port(non-80 port) under Nginx + Unicorn.
then all redirect action in your rails app will be leaded to http 80 port, this may be not you want.

Or when you deploy rails use Nginx + Unicorn, but you want to use a special non-80 port (e.g. 8080, 3000, and so on).

To use this gem, to config a special port in your production.rb file, above all problems will be resolved.

Add this line to your application's Gemfile: group :production do gem 'unicorn_use_special_port' end

And then execute:

$ bundle

Or install it yourself as:

$ gem install unicorn_use_special_port

Add this lines to your config/environments/production.rb

UnicornUseSpecialPort::BaseConfig.setup do |config|     
	config[:port]= xxxx #use your custom port, e.g. : 8080     
end	   

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request