elasticsearch-rails/lib/rails/templates/01-basic.rb [347:359]:
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unless ENV['RAILS_NO_SERVER_START']
  require 'net/http'
  if (begin; Net::HTTP.get(URI('http://localhost:3000')); rescue Errno::ECONNREFUSED; false; rescue Exception; true; end)
    puts        "\n"
    say_status  "ERROR", "Some other application is running on port 3000!\n", :red
    puts        '-'*80

    port = ask("Please provide free port:", :bold)
  else
    port = '3000'
  end

  puts  "", "="*80
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elasticsearch-rails/lib/rails/templates/04-dsl.rb [129:141]:
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unless ENV['RAILS_NO_SERVER_START']
  require 'net/http'
  if (begin; Net::HTTP.get(URI('http://localhost:3000')); rescue Errno::ECONNREFUSED; false; rescue Exception; true; end)
    puts        "\n"
    say_status  "ERROR", "Some other application is running on port 3000!\n", :red
    puts        '-'*80

    port = ask("Please provide free port:", :bold)
  else
    port = '3000'
  end

  puts  "", "="*80
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