Why do crawlers often show timeouts when crawling web page data

This article mainly explains why crawlers often show timeouts when crawling web data. Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn why crawlers often show timeouts when crawling web data.

1. The network is unstable: due to the instability of the network, there are many cases of IP timeout, which need to be tested one by one.

If the network returns to normal after the replacement of the network, if the unstable proxy IP of the client returns to normal after the replacement, and if the above two methods of the unstable network of the proxy server can return to normal, the network of a node of the client and proxy server network is unstable.

2. The concurrency of sending requests is too large: too large concurrent requests cause the agent IP to work overtime, so you only need to test the website access.

Browsers can access it properly even if a proxy IP is used. If it returns to normal, the concurrency is too large and the concurrency needs to be reduced.

3. Trigger the anti-climbing mechanism.

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