# File lib/rack/urlmap.rb, line 22
    def remap(map)
      @mapping = map.map { |location, app|
        if location =~ %r{\Ahttps?://(.*?)(/.*)}
          host, location = $1, $2
        else
          host = nil
        end

        unless location[0] == ?/
          raise ArgumentError, "paths need to start with /"
        end

        location = location.chomp('/')
        match = Regexp.new("^#{Regexp.quote(location).gsub('/', '/+')}(.*)", nil, 'n')

        [host, location, match, app]
      }.sort_by do |(host, location, _, _)|
        [host ? -host.size : INFINITY, -location.size]
      end
    end