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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52
第 6 章
request
和
response
对象
本章将学习
request
和
response
对象的重要内容。在
Express
应用中发生的一切，很大程度
上由它们开始，也由它们结束。如果使用
Express
构建一个
We
b
服务器，则大部分要做的
事情会始于一个
request
对象，而止于一个
response
对象。
这两个对象来自
Node
，
Express
则对它们做了扩展
。在深入探索这些对象能够带来什么之
前，先建立一点儿背景知识：客户端（通常指浏览器）是怎样向服务器请求一个页面，这
个页面又是怎样返回的。
6.1
URL
的各个组成部分
我们每天都会看见各种
URL
，但很少会去思考它们是怎么组成的。下面列举了一个
URL
的各个组成部分。
协议（protocol）
协议决定了请求将怎样传输。本书只会涉及
http
和
https
。其他常见协议包括
file
和
ftp
。
主机（host）
主机用来标识服务器。如果是在你的计算机（
localhost
）或本地网络上
，那么服务器可
以用一个名字或数字
IP
地址简单地标识
。在互联网中，主机会以顶级域名（
TLD
）结
尾，比如
.com
或
.net
。另外
，可能还会有
子域名
。子域名放在主机名的前面，怎么命
名都可以，比如
www
就是常见的子域名。子域名是可选添加的。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.