HTTP Accept Header 含义 [英] HTTP Accept Header meaning

问题描述

当浏览器的 Accept 请求标头显示如下内容时:

When a browser's Accept request header says something like the following:

Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5

这是否意味着 application/xml、application/xhtml+xml 和 text/html 都具有 的质量参数>0.9?

Does that mean that application/xml, application/xhtml+xml, and text/html all have a quality param of 0.9?

还是说application/xml和application/xhtml+xml有默认的(q=1)和text/html 有 q=0.9 参数?

Or does it mean that application/xml and application/xhtml+xml have the default (q=1) and text/html has the q=0.9 param?

我假设是前者，但希望有人更确切地知道.

I'm assuming the former, but was hoping someone knew more definitively.

推荐答案

不，如果 质量参数丢失 q=1.0 假定:

No, if the quality parameter is missing q=1.0 is assumed:

每个媒体范围可以后跟一个或多个接受参数，以q"参数开头，使用 qvalue 范围从 0 到 1(第 3.9 节)指示相对质量因子 […].默认值为 q=1.

Each media-range MAY be followed by one or more accept-params, beginning with the "q" parameter for indicating a relative quality factor […] using the qvalue scale from 0 to 1 (section 3.9). The default value is q=1.

所以给定的值被解释为:application/xml, application/xhtml+xml, and image/png首选媒体类型，但如果它们不存在，则发送 text/html 实体 (text/html;q=0.9)，如果不存在存在，然后发送 text/plain 实体 (text/plain;q=0.8)，如果不存在，则发送具有任何其他媒体类型的实体 (*/*;q=0.5)."

So the given value is to be interpreted as: "application/xml, application/xhtml+xml, and image/png are the preferred media types, but if they don’t exist, then send the text/html entity (text/html;q=0.9), and if that doesn’t exist, then send the text/plain entity (text/plain;q=0.8), and if that doesn’t exist, send an entity with any other media type (*/*;q=0.5)."

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