Why am i getting an argument error on line 13?

gistfile1.rb

#!/usr/bin/env ruby 

require 'net/http'
require 'uri'

module Bf
  module Web
    # Sends an http get request and returns an http response object
    #
    # * uri: String: "The desired uri"
    # * username: String
    # * password: String
    # * print_headers_on_redirect: Bool: Will print headers if the request
    #                              gets redirected. Defaults to false. 
    def Web.get(uri, username, password, print_headers_on_redirect=false)
      # URI object
      u = URI(uri)
      # Start a session
      Net::HTTP::start(u.host, u.port, :use_ssl => u.scheme == 'https') do |http|
        # force https
        if u.scheme == 'http'
          u.scheme = 'https'
        end
        request = Net::HTTP::Get.new uri
        # request.basic_auth(username, password)
        response = http.request(request)
        case response
        when Net::HTTPSuccess 
          response
        when Net::HTTPRedirection
          location = response['location']
          if print_headers_on_redirect
            response.each_header {|key, val| puts "#{key}: #{val}"}
          end
          get(location)
        else
          response
        end
      end
    end
  end 
end

# path = "http://www.github.com/users/miroswan/repos"
path = "https://google.com"
response_obj = Bf::Web.get(path, 'username', 'password')
puts response_obj.body