HTTP标头区分大小写吗？ [英] Are HTTP headers case-sensitive?

问题描述

在博客文章中，我使用以下PHP设置响应的内容类型：

In a blog post I use the following PHP to set the content-type of a response:

header('content-type: application/json; charset=utf-8');

我刚收到该帖子的评论说 content-type 需要大写， Content-type 。它是否正确？它似乎适用于所有小写的我，我假设HTTP标题不区分大小写。或者它是否正常工作，因为浏览器很好？

I just got a comment on that post saying that content-type needs to be capitalized, Content-type. Is this correct? It seems to work for me with all lower-case, and I assumed the HTTP headers were case-insensitive. Or does it just work because browsers are nice?

推荐答案

来自 RFC 2616 - 超文本传输​​协议 - HTTP / 1.1，第4.2节消息标题：

每个标题字段由名称后跟冒号（：）和字段值组成。字段名称不区分大小写。

Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive.

更新RFC 7230未列出任何来自RFC 2616的更改。

The updating RFC 7230 does not list any changes from RFC 2616 at this part.

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