“HTTP内容编码注册表”已经被更新注册如下：

   +----------+----------------------------------------+---------------+
   | Name     | Description                            | Reference     |
   +----------+----------------------------------------+---------------+
   | identity | Reserved (synonym for "no encoding" in | Section 5.3.4 |
   |          | Accept-Encoding)                       |               |
   +----------+----------------------------------------+---------------+