A web crawler needs to use a proxy IP when its real name is real.
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1. The crawled website has an anti-crawler mechanism. If you use IP to visit web pages repeatedly, IP is easily restricted and can no longer access the website, so you need to use proxy IP at this time.
2. Avoid being blocked by blocking.
The crawler is likely to be blocked when grabbing website data. Using proxy IP to exchange different IP, the site thinks it is a new user every time, of course, there is no risk of hackers.
3. The amount of crawling data is too large.
If the task is so large that it requires multi-machine and multi-thread concurrent crawling, the task must be completed with the help of an agent, otherwise it is easy to be discovered by the target server.
Proxy IP is not a necessity for web crawlers to work, but proxy IP is a tool to greatly improve the efficiency of web crawlers. Network work pays great attention to speed. Under the premise of everyone's high efficiency, improving the quality and efficiency of work is the significance of the existence of agent IP.
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