January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Content preview from PHP编程：第4版
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190
｜
第
8
章
Web
技术
类型。在标头后面，请求包含一个空行来指明标头的结束。如果所用的方法被允许（例如，
后面会讲到的
POST
方法），请求可以包含额外的数据。如果请求不包含任何数据，它将
以空行结束。
网页服务器收到请求，处理它，然后发送响应。
HTTP
响应的第一行看起来是这样的 ：
HTTP/1.1 200 OK
这行指定了协议版本、状态码和状态码的描述。此例中的情况是，状态码是
200
，意味
着请求是成功的（因此描述是
OK
）。在状态行后面，响应包含了给客户端的额外信息的
标头。例如
：
Date: Sat, 29 June 2019 14:07:50 GMT
Server: Apache/2.2.14 (Ubuntu)
Content-Type: text/html
Content-Length: 1845
Server
标头提供了网页服务器软件的信息，
Content-Type
标头指定这个响应数据的
MIME
类型。标头过后，响应包含一个空行，如果请求成功，紧接着的是数据。
最常用的
HTTP
方法是
GET
和
POST
。
GET
方法用来提取信息，例如，服务器上的一个文
件、一张图片或一个数据库查询的结果。
POST
方法意指传递信息，例如，信用卡号码或
要存储到服务器数据库的信息。
GET
方法等同于用户在网页浏览器中输入一个
URL
或单
击一个链接。当用户提交一个表单时，
GET
和
POST
方法都可以用，只需为
form
标签指
定
method
属性。我们将在后面“处理表单”一节讨论更多有关
GET
和
POST
方法的内容。
变量
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.