# File lib/rack/urlmap.rb, line 29
    def call(env)
      path = env["PATH_INFO"].to_s.squeeze("/")
      hHost, sName, sPort = env.values_at('HTTP_HOST','SERVER_NAME','SERVER_PORT')
      @mapping.each { |host, location, app|
        if (hHost == host || sName == host \
          || (host.nil? && (hHost == sName || hHost == sName+':'+sPort))) \
          and location == path[0, location.size] \
          and (path[location.size] == nil || path[location.size] == ?/)
          env["SCRIPT_NAME"] += location.dup
          env["PATH_INFO"] = path[location.size..-1]
          env["PATH_INFO"].gsub!(/\/\z/, '')
          env["PATH_INFO"] = "/"  if env["PATH_INFO"].empty?
          return app.call(env)
        end
      }
      [404, {"Content-Type" => "text/plain"}, ["Not Found: #{path}"]]
    end