一个请求的访问流程_html/css_WEB-ITnose-HTML Tutorial-php.cn

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一个请求的访问流程_html/css_WEB-ITnose

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Jun 24, 2016 am 11:21 AM

IP：是网络中唯一标识一台电脑的逻辑标识。

特例：127.0.0.1 localhost

例子：192.168.33.xxx （对应门牌号码，身份证号码）

点分十进制形式，分成四段

范围：0~255.0~255. 0~255. 0~255

DN：Domain Name 域名例子：www.baidu.com

DNS：Domain Name Server域名服务器域名服务器（可以理解成一台电脑）

主要作用和就是将我们所输入的www.xx.com域名，转成能够唯一标识www.xx.com服务器的IP。

hosts：是windows的一个系统文件，其中可以设置ip与域名的关系

文件位置：

流程图(理解):

域名的作用:

对外，供访问

对内，提供域名与目录的对应关系

步骤说明：

http://www.163.com/index.html
第1步：在本机的hosts文件中查找域名与IP的对应关系，

第2步：如果1步中找解析不成功，那么则到本地互联网服务提供商的DNS服务器解析。第3步：向域名对应的ip所指向的Web服务器发送index.html文件请求

第4步：当web服务器收到此文件请求后，会在本机的硬盘中查找index.html文件，并将内容返回的浏览器。

第5步：浏览器收到服务器响应的index.html文件内容后，将其解释成我们常见的页面。

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