What Are the Common Anti-Scraping Techniques?
What Are the Common Anti-Scraping Techniques?
User-Agent Control:
The User-Agent field in the HTTP header describes the client's type and operating system information, allowing servers to identify details like the user's operating system version, CPU type, browser type, and version. Target websites can recognize scraping behavior by inspecting the User-Agent. Many websites have User-Agent whitelists, permitting only requests within the whitelist to access their content.
IP-Based Restrictions:
If multiple similar requests are sent from the same IP address within a short time, the target website may interpret it as scraping behavior and restrict or block that IP address. In such cases, scraping programs need to employ anti-anti-scraping techniques to bypass these restrictions. ShineProxy is a website that provides high-anonymity and stable proxy IP services. It offers abundant IP resources and flexible payment options to meet the diverse needs of users. Using proxy IPs can assist scraping programs in better evading detection by target websites, enabling successful data extraction.
Request Interval Setting:
While most web scrapers adhere to a scraping strategy, malicious scrapers may relentlessly attack a specific website. To counter such behavior, implementing request intervals can prevent excessive requests within a short period, which might disrupt the website's normal operation. Request interval refers to the waiting time set by the scraping program before sending each request, effectively controlling the speed and frequency of accessing the target website.
Parameter Encryption:
To deter data scraping, certain websites encrypt or concatenate request parameters, increasing the complexity of deciphering and preventing malicious scraping. Common parameter encryption methods include MD5, Base64, SHA1 encryption algorithms, as well as simple encoding techniques like XOR, bitwise operations, and reverse order. Additionally, some websites employ dynamically changing encryption methods to thwart scraping attempts, such as generating dynamic parameters using JavaScript or employing CAPTCHA verification to increase the difficulty of scraping.
robots.txt Restrictions:
"robots.txt" is a specification file used to restrict web crawlers. This text file, located in the website's root directory, specifies which pages should not be accessed or crawled by web crawlers. When search engine crawlers access a website, they read and adhere to the rules defined in the robots.txt file. While not mandatory, most search engines and web crawlers respect the rules outlined in robots.txt. Using this specification file allows website owners to better control which individuals and bots can access their website information.
User-Agent Control:
The User-Agent field in the HTTP header describes the client's type and operating system information, allowing servers to identify details like the user's operating system version, CPU type, browser type, and version. Target websites can recognize scraping behavior by inspecting the User-Agent. Many websites have User-Agent whitelists, permitting only requests within the whitelist to access their content.
IP-Based Restrictions:
If multiple similar requests are sent from the same IP address within a short time, the target website may interpret it as scraping behavior and restrict or block that IP address. In such cases, scraping programs need to employ anti-anti-scraping techniques to bypass these restrictions. ShineProxy is a website that provides high-anonymity and stable proxy IP services. It offers abundant IP resources and flexible payment options to meet the diverse needs of users. Using proxy IPs can assist scraping programs in better evading detection by target websites, enabling successful data extraction.
Request Interval Setting:
While most web scrapers adhere to a scraping strategy, malicious scrapers may relentlessly attack a specific website. To counter such behavior, implementing request intervals can prevent excessive requests within a short period, which might disrupt the website's normal operation. Request interval refers to the waiting time set by the scraping program before sending each request, effectively controlling the speed and frequency of accessing the target website.
Parameter Encryption:
To deter data scraping, certain websites encrypt or concatenate request parameters, increasing the complexity of deciphering and preventing malicious scraping. Common parameter encryption methods include MD5, Base64, SHA1 encryption algorithms, as well as simple encoding techniques like XOR, bitwise operations, and reverse order. Additionally, some websites employ dynamically changing encryption methods to thwart scraping attempts, such as generating dynamic parameters using JavaScript or employing CAPTCHA verification to increase the difficulty of scraping.
robots.txt Restrictions:
"robots.txt" is a specification file used to restrict web crawlers. This text file, located in the website's root directory, specifies which pages should not be accessed or crawled by web crawlers. When search engine crawlers access a website, they read and adhere to the rules defined in the robots.txt file. While not mandatory, most search engines and web crawlers respect the rules outlined in robots.txt. Using this specification file allows website owners to better control which individuals and bots can access their website information.
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