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Crawler data capture should know that using high-quality and stable HTTP proxy IP can get twice the result with half the effort, because most anti crawling strategies often limit the frequency and total number of accesses. When using proxy IP, IP timeout will occur due to operation or ignorance, which is also a common problem. So what are the factors that make up the stability of proxy?
1. Network stability. The instability of its own network will also lead to the instability of proxies.
There are many IP timeouts caused by network instability, which need to be tested one by one. If the network returns to normal after replacement, your client is unstable; If the proxy IP returns to normal after replacement, the proxy server network is unstable; If the above two methods can be used, the network of a node in the client and proxy server network is unstable; If it returns to normal after changing the website, it indicates that the target website server is unstable.
2. Too many concurrent requests.
If the concurrent request is too large, resulting in the proxy IP timeout, only the website access test needs to be carried out. Even if the browser is used for normal access when using the proxy IP, if it returns to normal, the concurrent request is too large and needs to be reduced.
3. Trigger the anti crawling mechanism. The test of triggering the anti crawling mechanism is the same as the test of excessive concurrency.
The test that triggers the anti crawl mechanism is the same as the test with too large concurrency. You only need to use the browser to access the site when using the proxy IP. Generally, the crawler may trigger the anti crawling mechanism of the site, which needs to be operated after replacing the proxy.