http - 将单个 HTTP header 的多个值添加到请求或响应的标准

Question

如果我想添加一个值列表作为 HTTP header ，是否有标准方法可以做到这一点？我在 RFC 822 中找不到任何东西(我很容易理解)。例如，是逗号分隔值标准或分号分隔值。有标准吗？

例子:

Key: value1;value2;value3

Answer 1

您需要查看 HTTP 规范 RFC 2616它说:

Multiple message-header fields with the same field-name MAY be present in a message if and only if the entire field-value for that header field is defined as a comma-separated list [i.e., #(values)]. It MUST be possible to combine the multiple header fields into one "field-name: field-value" pair, without changing the semantics of the message, by appending each subsequent field-value to the first, each separated by a comma. The order in which header fields with the same field-name are received is therefore significant to the interpretation of the combined field value, and thus a proxy MUST NOT change the order of these field values when a message is forwarded.

这意味着您可以在具有不同值的响应中多次发送相同的 header ，只要这些值可以使用逗号相互附加即可。这也意味着您可以通过用逗号连接它们来在单个 header 中发送多个值。

所以在你的情况下它将是:

Key: value1,value2,value3