generating sitemaps how do i make xml.url and xml.loc return https instead of http

[fugee ohu]

   base_url = "https://#{request.host_with_port}/"

   xml.url do

      xml.loc base_url

      xml.changefreq "monthly"

      xml.priority 0.3

   end

  @people.each do |person|

    xml.url do

      xml.loc base_url+'person_url(person)

      xml.lastmod person.updated_at.to_date.to_s(:db)

      xml.changefreq "monthly"

      xml.priority 0.3

    end

  end