HTTP Accept Header的意思(HTTP Accept Header meaning)

HTTP Accept Header的意思(HTTP Accept Header meaning)

当浏览器的Accept请求头显示如下：

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0.9的质量参数？

或者这是否意味着application/xml和application/xhtml+xml具有默认值（ q=1 ）， text/html有q=0.9参数？

我假设是前者，但希望有人更加明确地知道。

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

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

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?

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

最满意答案

否，如果缺少质量参数 q=1.0 ：

每个媒体范围可以跟随一个或多个接受参数，从“q”参数开始，以使用q值从0到1（第3.9节）来指示相对品质因子[...]。 默认值为q = 1。

所以给定的值被解释为：“ application / xml ， application / xhtml + xml ”和“ image / png”是首选的媒体类型，但如果不存在，则发送text / html实体（ text/html;q=0.9 ），如果不存在，则发送文本/纯 text/plain;q=0.8 （ 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 ）。

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

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.

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).”