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What are the methods to prevent crawlers?
Anti-crawler methods include Robots.txt text, User-Agent filtering, IP restrictions, verification codes, dynamic page generation, frequency limits, dynamic URL parameters and anti-crawler technology. Website administrators can choose appropriate methods to protect the security of the website and the privacy of users according to their own needs.
Configuring the User-Agent method of filtering crawlers in NginxIt's hard to see at first glance, it's basically a useragent called "yisouspider" that flooded the screen. I don't know where the spider is from at first glance. It's so shameless. Find the root directory configuration area, add the useragent filter judgment statement, and find that the one called "yisouspider" directly returns 403 Note 1: If you need to add multiple filters, do this ($http_user_agent~*"spider1|spider2|spider3|spider4"), in the middle Just separate them with | Note 2: If you are using a subdirectory blog, like mine, then you need to find
How do websites set black/whitelist IP restrictions and country and city IP access restrictions through nginx?1. Black/white list IP restricted access configuration nginx There are several ways to configure black and white lists. Here are only two commonly used methods. 1. The first method: allow, denydeny and allow instructions belong to ngx_http_access_module. nginx loads this module by default, so it can be used directly. This method is the simplest and most direct. The setting is similar to the firewall iptable. How to use: Add directly to the configuration file: #Whitelist settings, followed by allow is accessible IPlocation/{allow123.13.123.12;allow23.53.32.1/100;denyall;}#Blacklist settings,
PHP SMS verification code function development tutorialPHP SMS Verification Code Function Development Tutorial With the popularity and influence of mobile phones, SMS verification codes have become an important verification method in many websites and applications. In PHP development, how to implement the SMS verification code function? This article will introduce you to a simple and practical method for developing the SMS verification code function. To use the SMS verification code function to register an SMS platform account, you first need to register an SMS platform account. There are many SMS platform providers on the market, such as Alibaba Cloud SMS, Rongyun Cloud Communications, etc. After registering an account, you will receive APIKe
How to use PHP to implement the dynamic page generation function of CMS systemHow to use PHP to implement the dynamic page generation function of the CMS system. With the development of the Internet, the CMS (Content Management System) system has become an essential tool for many websites. A good CMS system can not only manage the content of the website, but also generate dynamic pages. This article will introduce how to use PHP language to realize the dynamic page generation function of CMS system, and provide relevant code examples. 1. Basic principles of dynamic page generation Dynamic page generation refers to the
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