Python happy enemy: crawler and anti crawler with a solution to give you New Year

Java architects Alliance 2021-02-23 01:05:08
python happy enemy crawler anti

Before we know what anti crawler means , Let's first take a look at what a reptile is ?

What is a reptile

In modern society , The Internet is full of useful data , We just need to be patient , Plus some technical means , You can get a lot of valuable data . there " Technical means " It's a web crawler .

A crawler is a program that automatically gets the content of a web page , Search engines, for example ,Google,Baidu etc. , There's a huge crawler system running every day , Crawling data from websites around the world , For users to use when searching .

Malicious crawlers not only take up a lot of website traffic , Cause users with real needs can't enter the website , At the same time, it may also cause the leakage of key information of the website , Affect website or app Normal operation of .

So for websites with high data value , Website developers will give some technical means for web crawlers .

Want to achieve a simple case of crawler , You can go to the article I wrote before :

Five steps to explore the truth behind the crawler crawling video barrage , Attached crawler implementation source code

Common anti crawler measures

generally speaking , We will subdivide the anti crawler methods from the characteristics , Can be divided into information verification anti crawler 、 Dynamic rendering anti crawler 、 Text obfuscation anti crawler 、 Behavior verification, anti crawler, etc .

The text obfuscation anti crawler is the most interesting one , The behavior verification anti crawler is the most difficult one .

Text obfuscation anti crawler

Text obfuscation is simply how to effectively avoid crawler acquisition Web Important text data in application . The premise of anti crawler is that it can't affect the user's normal browsing and reading text content , It's easy to see directly confused text , Therefore, developers usually use the mapping relationship between fonts to achieve confusion .

for example : Text mapping of Auto Home Forum .

Python Introduction to reptiles ! The most anti crawler series of the whole web

Here, through font mapping for some special characters , When a web crawler collects data, it can't get complete data directly , And it does not affect the normal reading of normal users .

Dynamic rendering anti crawler

With the continuous iteration of technology in the era , More and more websites have changed from static data loading to dynamic data loading , And in the process of dynamic loading is accompanied by more and more data encryption .

Dynamic data loading is easy to understand , Let the browser load the general framework of the website first , After completion, send asynchronous request to complete data filling , In the process of sending the request, by encrypting the request parameters , To block very low-level crawler scripts .

for example : Red man data set ---js Parameter encryption

Python Introduction to reptiles ! The most anti crawler series of the whole web

Here, when sending an asynchronous request , Verify key parameters , Directly intercept some of the most basic crawler requests , It is necessary to simulate the process of parameter encryption , In order to get the data normally .

Behavior verification anti crawler

Behavioral captcha is a kind of popular captcha . Understand... Literally , It is to complete the verification through the user's operation behavior , Without the need to read distorted pictures and words . There are two kinds of common : Drag and touch .

for example :12306 Login verification code --- Touch behavior verification

Python Introduction to reptiles ! The most anti crawler series of the whole web

After identifying the image according to the user , Make a choice to judge , Whether the request is currently made by a normal user , Used to block out low tech crawler programs .

Finally, crawler and anti crawler are the battle of wits and bravery among Internet development engineers . As a website developer, we should master the technology of crawler , We need to learn more about how to implement anti crawler .

If you want to further study, you can continue to pay attention to , Next, we will update a series of specific anti crawler solutions for websites .

Thank you for attention ~

Need more python Related to the source code , It can be in mine git Take it from the warehouse , There are also Java And big data related code , If you want to learn, you can take it by yourself, and it will be updated in the future

The warehouse address is here


For starters , stay readme in , I also wrote about python Some initial introductions of , You can check it yourself

Official account :Java Architects Alliance , Be a versatile coder

本文为[Java architects Alliance]所创,转载请带上原文链接,感谢

  1. 利用Python爬虫获取招聘网站职位信息
  2. Using Python crawler to obtain job information of recruitment website
  3. Several highly rated Python libraries arrow, jsonpath, psutil and tenacity are recommended
  4. Python装饰器
  5. Python实现LDAP认证
  6. Python decorator
  7. Implementing LDAP authentication with Python
  8. Vscode configures Python development environment!
  9. In Python, how dare you say you can't log module? ️
  10. 我收藏的有关Python的电子书和资料
  11. python 中 lambda的一些tips
  12. python中字典的一些tips
  13. python 用生成器生成斐波那契数列
  14. python脚本转pyc踩了个坑。。。
  15. My collection of e-books and materials about Python
  16. Some tips of lambda in Python
  17. Some tips of dictionary in Python
  18. Using Python generator to generate Fibonacci sequence
  19. The conversion of Python script to PyC stepped on a pit...
  20. Python游戏开发,pygame模块,Python实现扫雷小游戏
  21. Python game development, pyGame module, python implementation of minesweeping games
  22. Python实用工具,email模块,Python实现邮件远程控制自己电脑
  23. Python utility, email module, python realizes mail remote control of its own computer
  24. 毫无头绪的自学Python,你可能连门槛都摸不到!【最佳学习路线】
  25. Python读取二进制文件代码方法解析
  26. Python字典的实现原理
  27. Without a clue, you may not even touch the threshold【 Best learning route]
  28. Parsing method of Python reading binary file code
  29. Implementation principle of Python dictionary
  30. You must know the function of pandas to parse JSON data - JSON_ normalize()
  31. Python实用案例,私人定制,Python自动化生成爱豆专属2021日历
  32. Python practical case, private customization, python automatic generation of Adu exclusive 2021 calendar
  33. 《Python实例》震惊了,用Python这么简单实现了聊天系统的脏话,广告检测
  34. "Python instance" was shocked and realized the dirty words and advertisement detection of the chat system in Python
  35. Convolutional neural network processing sequence for Python deep learning
  36. Python data structure and algorithm (1) -- enum type enum
  37. 超全大厂算法岗百问百答(推荐系统/机器学习/深度学习/C++/Spark/python)
  38. 【Python进阶】你真的明白NumPy中的ndarray吗?
  39. All questions and answers for algorithm posts of super large factories (recommended system / machine learning / deep learning / C + + / spark / Python)
  40. [advanced Python] do you really understand ndarray in numpy?
  41. 【Python进阶】Python进阶专栏栏主自述:不忘初心,砥砺前行
  42. [advanced Python] Python advanced column main readme: never forget the original intention and forge ahead
  43. python垃圾回收和缓存管理
  44. java调用Python程序
  45. java调用Python程序
  46. Python常用函数有哪些?Python基础入门课程
  47. Python garbage collection and cache management
  48. Java calling Python program
  49. Java calling Python program
  50. What functions are commonly used in Python? Introduction to Python Basics
  51. Python basic knowledge
  52. Anaconda5.2 安装 Python 库(MySQLdb)的方法
  53. Python实现对脑电数据情绪分析
  54. Anaconda 5.2 method of installing Python Library (mysqldb)
  55. Python implements emotion analysis of EEG data
  56. Master some advanced usage of Python in 30 seconds, which makes others envy it
  57. python爬取百度图片并对图片做一系列处理
  58. Python crawls Baidu pictures and does a series of processing on them
  59. python链接mysql数据库
  60. Python link MySQL database