def raw
      headers = http_headers.map { |k, v| "#{k}: #{v}\r\n" }.join
      format "%s %s %s\r\n%s\r\n%s", request_method.upcase, fullpath, env["SERVER_PROTOCOL"], headers, body_string
    end
def raw
      headers = http_headers.map { |k, v| "#{k}: #{v}\r\n" }.join
      format "%s %s %s\r\n%s\r\n%s", request_method.upcase, fullpath, env["SERVER_PROTOCOL"], headers, body_string
    end
Get full HTTP request in HTTP format.

 @return [String]