# File lib/webmock/rack_response.rb, line 19
    def build_rack_env(request)
      uri = request.uri
      headers = request.headers || {}
      body = request.body || ''

      env = {
        # CGI variables specified by Rack
        'REQUEST_METHOD' => request.method.to_s.upcase,
        'CONTENT_TYPE'   => headers.delete('Content-Type'),
        'CONTENT_LENGTH' => body.size,
        'PATH_INFO'      => uri.path,
        'QUERY_STRING'   => uri.query || '',
        'SERVER_NAME'    => uri.host
      }

      # Rack-specific variables
      env['rack.input']      = StringIO.new(body)
      env['rack.version']    = Rack::VERSION
      env['rack.url_scheme'] = uri.scheme
      env['rack.run_once']   = true
      env['rack.session']    = session

      headers.each do |k, v|
        env["HTTP_#{k.tr('-','_').upcase}"] = v
      end

      env
    end