用于 JSON 的内容类型标头是什么？“应用程序/json；字符集=utf-8”还是“应用程序/json”？
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What content type header to use for JSON? "application/json; charset=utf-8 " or "application/json"?
提问by Bobo
It seems that the JSON default encoding is UTF-8 and Spring MVC returns application/json; charset=utf-8by default, which is hard to change.
貌似JSON默认编码是UTF-8，Spring MVCapplication/json; charset=utf-8默认返回 ，很难改。
回答by Joachim Sauer
According to RFC 4627
根据RFC 4627
JSON text SHALL be encoded in Unicode. The default encoding is UTF-8.
JSON 文本应以 Unicode 编码。默认编码为 UTF-8。
It goes on to describe how the different UTF-* encoding are to be detecting, suggesting that no other encodings are supported.
它继续描述如何检测不同的 UTF-* 编码，表明不支持其他编码。
"SHALL" represents an absolute requirement here (see RFC 2119).
“SHALL”在这里代表绝对要求（参见RFC 2119）。
And there really is no reason to use a non-UTF encoding with JSON (as anything that can handle JSON can definitelyhandle UTF-8).
而且真的没有理由对 JSON 使用非 UTF 编码（因为任何可以处理 JSON 的东西肯定可以处理 UTF-8）。
回答by Julian Reschke
Returning a charset parameter on application/json is incorrect, as that media type does not define a charset parametert. See https://greenbytes.de/tech/webdav/rfc8259.html#rfc.section.11, last sentence:
在 application/json 上返回字符集参数是不正确的，因为该媒体类型没有定义字符集参数。见https://greenbytes.de/tech/webdav/rfc8259.html#rfc.section.11，最后一句：
Note: No "charset" parameter is defined for this registration. Adding one really has no effect on compliant recipients.
注意：没有为此注册定义“字符集”参数。添加一个确实对合规的收件人没有影响。
