When crawler is used to crawl data, it is easy to be disabled by the anti-crawler mechanism of the website servers, in order to avoid this situation, most choose HTTP proxy servers to complete the work. However, many users using HTTP proxy servers will often be blocked, so why is HTTP proxy servers crawler collection still blocked?
This is because many users have misconceptions about HTTP proxy servers. HTTP proxy servers is not a cure-all and can also be blocked if used incorrectly.
1. HTTP proxy servers is generally divided into three categories: transparent proxy, common anonymous proxy, and advanced anonymous proxy. If you use transparent proxy and common anonymous proxy, other web servers will detect the servers address using this proxy, and it will be restricted.
2. When using HTTP proxy servers crawler, there are many factors that will cause servers to be blocked, such as cookie and UserAgent, which cannot be cleared. After reaching the threshold set by the target website, servers will be blocked.
3. Due to the low access frequency of ordinary users, if the frequency of accessing the target website is too fast, servers will also be blocked, and the anti-crawling strategy will identify the access too fast.
The above is a brief introduction to the reason why THE HTTP proxy servers crawler is blocked. If you want to avoid THE servers blocking, you should try to simulate the normal access of real users.
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