June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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request
和
response
对象
｜
55
1.
打开
JavaScript
控制台。
2.
点击“
Network
”标签页。
3.
重新加载页面。
4.
从请求列表中选择当前
HTML
（应该是第一个）。
5.
点击“
Headers
”标签页，就可以看到所有的响应头。
6.5
互联网媒体类型
Content-Type
这个
HTTP
头至关重要，要是没有它，客户端就只能费力地去猜要怎样渲染
内容。
Content-Type
头的格式是一个
互联网媒体类型
，包含类型、子类型以及可选参数。
例如，
text/html; charset=UTF-8
指定了类型为“
text
”，子类型为“
html
”，字符编码为
UTF-8
。“互联网号码分配局”
（
IANA
）维护着互联网媒体类型的官方列表。很多时候，你
会发现“内容类型”“互联网媒体类型”和“
MIME
类型”几个词语被混用。
MIME
（多用
途互联网邮件扩展）曾是互联网媒体类型的前身，如今，二者等价。
6.6
请求的
Body
除了请求头，请求还可以包含一个
body
（正如响应的
body
是要返回的实际内容一样）。正
常的
GET
请求是不包含
body
的，但
POST
请求通常会包含。对于
POST
的
body
来说，最
常用的媒体类型是
application/x-www-form-urlencoded
，它只是以“
&
”分隔的经过编码
的名
/
值对（基本上跟查询串的格式一样）。如果
POST
请求需要支持文件上传，那么媒体
类型就是
multipart/form-data
，这是一种更复杂的格式。最后，
Ajax
请求的
body
可以使
用
application/json ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.