# File lib/mechanize/test_case.rb, line 212
  def do_GET(req, res)
    if req['Accept-Encoding'] =~ /gzip/
      if name = req.query['file'] then
        open("#{Mechanize::TestCase::TEST_DIR}/htdocs/#{name}", 'r') do |io|
          string = ""
          zipped = StringIO.new string, 'w'
          Zlib::GzipWriter.wrap zipped do |gz|
            gz.write io.read
          end
          res.body = string
        end
      else
        res.body = ''
      end
    res['Content-Encoding'] = req['X-ResponseContentEncoding'] || 'gzip'
    res['Content-Type'] = "text/html"
    else
      res.code = 400
      res.body = 'no gzip'
    end
  end