encoding - HTTP Accept-Encoding 并发送未编码的数据

Question

我构建了一个用于压缩 HTTP 输出的模块。阅读spec ，我在以下几件事上没有发现明显的区别:

接受编码:

是否应将其视为与 Accept-Encoding: * 相同，还是视为不存在 header ？

或者如果我不支持 gzip，但我得到这样的 header 怎么办:

接受编码:gzip

我应该返回 406 错误还是仅返回未编码的数据？

编辑:

我已经阅读了该规范几次。它提到了我的第一个案例，但它没有定义服务器的行为应该是什么。

我应该将这种情况视为 header 不存在吗？或者我应该返回 406 错误，因为无法对给定字段值的内容进行编码(“”不是有效的编码)。

Answer 1

所有内容都写在Spec: 14.3 Accept-Encoding中:

The special "*" symbol in an Accept-Encoding field matches any available content-coding not explicitly listed in the header field.

If an Accept-Encoding field is present in a request, and if the server cannot send a response which is acceptable according to the Accept-Encoding header, then the server SHOULD send an error response with the 406 (Not Acceptable) status code.

编辑:

If the Accept-Encoding field-value is empty, then only the "identity" encoding is acceptable.

In this case, if "identity" is one of the available content-codings, then the server SHOULD use the "identity" content-coding, unless it has additional information that a different content-coding is meaningful to the client.

What is "identity"

identity
The default (identity) encoding; the use of no transformation whatsoever. This content-coding is used only in the Accept- Encoding header, and SHOULD NOT be used in the Content-Encoding header.