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How to use port_key method of Capybara Package

Best Capybara code snippet using Capybara.port_key

server.rb

Source:server.rb

...26      @server_thread = nil # suppress warnings27      @host = deprecated_options[1] || host28      @reportable_errors = deprecated_options[2] || reportable_errors29      @port = deprecated_options[0] || port30      @port ||= Capybara::Server.ports[port_key]31      @port ||= find_available_port(host)32      @checker = Checker.new(@host, @port)33    end34    def reset_error!35      middleware.clear_error36    end37    def error38      middleware.error39    end40    def using_ssl?41      @checker.ssl?42    end43    def responsive?44      return false if @server_thread&.join(0)45      res = @checker.request { |http| http.get('/__identify__') }46      return res.body == app.object_id.to_s if res.is_a?(Net::HTTPSuccess) || res.is_a?(Net::HTTPRedirection)47    rescue SystemCallError, Net::ReadTimeout, OpenSSL::SSL::SSLError48      false49    end50    def wait_for_pending_requests51      timer = Capybara::Helpers.timer(expire_in: 60)52      while pending_requests?53        raise 'Requests did not finish in 60 seconds' if timer.expired?54        sleep 0.0155      end56    end57    def boot58      unless responsive?59        Capybara::Server.ports[port_key] = port60        @server_thread = Thread.new do61          Capybara.server.call(middleware, port, host)62        end63        timer = Capybara::Helpers.timer(expire_in: 60)64        until responsive?65          raise 'Rack application timed out during boot' if timer.expired?66          @server_thread.join(0.1)67        end68      end69      self70    end71    def base_url72      "http#{'s' if using_ssl?}://#{host}:#{port}"73    end74  private75    def middleware76      @middleware ||= Middleware.new(app, @reportable_errors, @extra_middleware)77    end78    def port_key79      Capybara.reuse_server ? app.object_id : middleware.object_id80    end81    def pending_requests?82      middleware.pending_requests?83    end84    def find_available_port(host)85      server = TCPServer.new(host, 0)86      server.addr[1]87    ensure88      server&.close89    end90  end91end...

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