HTTP 内容编码，base64 [英] HTTP content encoding, base64

问题描述

有没有办法知道 HTTP 响应的消息体是否使用 Base64 编码?

Is there any way to know if the message body of an HTTP response is encoded with Base64?

我了解到内容传输编码不是 HTTP 标头的一部分.

I learnt that content-transfer-encoding is not part of HTTP header.

那么，哪个 HTTP 标头表明内容是使用 Base64 编码的?我认为内容编码仅用于压缩.

So, which HTTP header indicates that the content is encoded with Base64? I think Content-encoding is only used for compressions.

推荐答案

据我了解，一个 HTTP 正文可能没有用 Base64 编码:

As far as I understand, an HTTP body may not be encoded in Base64:

HTTP 不使用 RFC 的 Content-Transfer-Encoding (CTE) 字段2045. 从符合 MIME 的协议到 HTTP 的代理和网关必须删除任何非身份 CTE(quoted-printable"或base64")编码在将响应消息传递给 HTTP 客户端之前.

HTTP does not use the Content-Transfer-Encoding (CTE) field of RFC 2045. Proxies and gateways from MIME-compliant protocols to HTTP MUST remove any non-identity CTE ("quoted-printable" or "base64") encoding prior to delivering the response message to an HTTP client.

身份:

默认(身份)编码；使用无转换无论如何.

The default (identity) encoding; the use of no transformation whatsoever.

当然，您可以使用 HTTP 传输 Base64 编码的数据，但这应该是双方(客户端和服务器)都同意的，而且似乎没有标题来描述这种行为.

Of course you're allowed to transport Base64-encoded data using HTTP, but that should be something both parties (client and server) agree on, and there doesn't seem to be a header to describe this behavior.

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