"PHP HTTP Protocol Video Tutorial" will lead you to learn the HTTP protocol in PHP, master http interactive requests, such as post, and get requests, and use code to implement common post and get requests, as well as anti-leeching and reverse Advanced applications such as Ajax.
Course playback address: http://www.php.cn/course/411.html
The teacher’s teaching style:
The teacher’s lectures are vivid, witty, witty, and touching. A vivid metaphor is like the finishing touch, opening the door to wisdom for students; a well-placed humor brings a knowing smile to students, like drinking a glass of mellow wine, giving people aftertaste and nostalgia; a philosopher's aphorisms, cultural references Proverbs are interspersed from time to time in the narration, giving people thinking and warning.
The more difficult point in this video is to prevent http hotlinking:
Use the HTTP protocol. Use referer to prevent hotlinking (it does not need to be written in PHP, but it is OK to control it at the server level)
When we access pictures outside the site on the web page, the pictures can be seen on the site, but not outside. I saw
because of the referer element in the header information.
Also when doing statistics,
we can count where and when users visit the website. For example, when Tencent analyzes the website
, how does it know where users go from when calculating statistics?
In the HTTP protocol, there is a very important option referer
referer in the header information. It is the source of the web page and the address of the previous page.
If you enter the address directly into the browser and enter the website, there will be no referer header information.
Therefore, the server can know which website the user came from based on the referer. The incoming and which website the picture comes from
The specific steps to use the referer header information to set up anti-hotlinking are as follows:
/**
如何配置apache服务器。用于图片防盗链（使用url重写）
在web服务器层面，我们可以在http协议的referer头信息来判断，
如果来自站外，则统一重写到一个很小的防盗链提醒图片上去
步骤：
1.打开 apache 重写模块 mod_rewrite
（D:\wamp\bin\apache\apache2.4.9\conf）
#LoadModule rewrite_module modules/mod_rewrite.so
把#去掉，重启apache
2.在需要防盗的网站或者目录下，写 .htaccess 文件（windows下不能直接创建，可以另存）
并指定防盗链规则
分析referer信息，如果不是来自本站，则重写
**/
重写规则 .htaccess 文件
1.哪种情况重写规则
是jpeg/gif/png图片的时候
是referer头与localhost不匹配的时候
2.怎么重写
统一 rewrite 到某个防盗链图片上
RewriteEngine On
//只是在改页面下生效
Rewrite Base /HTTPxieyi/day1
//会对以下格式的文件进行重写规则
RewriteCond %{REQUEST_FILENAME} .*\.(jpg|jpeg|gif|png) [NC]
//如果不是来自localhost的用户，会重写
RewriteCond %{HTTP_REFERER} !localhost [NC]
//会重写到自学it网的logo上
RewriteRule .* http://www.zixue.it/static/image/common/zixuelogo.pngThe specific code of html The specific code for anti-hotlinking is as follows
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片的防盗链</title>
</head>
<body>
<p>
<img src="/static/imghwm/default1.png" data-src="http://imgsrc.baidu.com/forum/w%3D580%3B/sign=5547962a02d162d985ee621421e4a8ec/0d338744ebf81a4c06403427df2a6059242da6ea.jpg" class="lazy" alt="">
<img src="/static/imghwm/default1.png" data-src="./bb.jpg" class="lazy" alt="">
<img src="/static/imghwm/default1.png" data-src="./aa.jpg" class="lazy" alt="">
</p>
</body>
</html>:
<?php
/**
反防盗链
****/
require('./07.class.php');
$http = new Http('http://localhost/HTTPxieyi/day1/bb.jpg');
//如果没有加以下这句话，就会显示盗链
//加上referer就会告诉浏览器，我是来自localhost的，不是来自其他网站的，你不用防我
$http->setHeader('Referer: http://localhost');
$res = $http->get();
//aaa.显示的倒链
//file_put_contents('./aaa.jpg',substr(strstr($res,"\r\n\r\n"),4));
file_put_contents('./bbb.jpg',substr(strstr($res,"\r\n\r\n"),4));
//应该在判断路径或者response的mime头信息，确定图片的类型The above is the detailed content of Recommendation of php http protocol video resources. For more information, please follow other related articles on the PHP Chinese website!
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