When crawling website data, using only your own IP address or a single proxy may reduce the reliability of the crawling, geolocation options, and the number of concurrent requests that can be made. To solve this problem, proxy pools can be built to spread traffic over a large number of proxy IP addresses. The size of the proxy pool depends on several factors, but here are five main ones:
1, the number of requests per hour: in the data fetching task, if a large number of requests need to be processed, the size of the proxy pool must be large enough to ensure that each request can get a valid proxy IP to access, so as to avoid fetching failure due to proxy IP exhaustion.
Data crawling tasks may require frequent requests to the target website, especially in the case of large-scale data crawling, the volume of requests per hour can be very large. If you rely on only a limited number of proxy ips, these ips will soon be blocked or restricted by the target site due to the frequency of requests, making the crawling task impossible to continue. To solve this problem, it is critical to build a large enough pool of agents.
An adequate proxy pool can provide enough proxy IP addresses to rotate so that each request can obtain a new, unblocked proxy IP from the proxy pool. There are two main advantages to doing this:
First, the proxy pool can maintain the stability and continuity of requests. Even if some proxy IP addresses are blocked by the target site or fail, other proxy IP addresses in the proxy pool can still be top, ensuring the continuous data fetching task.
Second, proxy pools can spread out requests, reducing the frequency of requests for a single IP. By rotating the use of multiple proxy IP addresses, the volume of requests sent by each IP is relatively small, reducing the risk of being identified as abnormal behavior by the target website and helping to circumvent anti-crawler measures.
2, target website: different websites have different strategies against robots, some large websites take complex anti-robot countermeasures, which requires a larger pool of agents to deal with. This is because frequent requests to these sites can result in proxy IP being blocked, so more proxy IP is needed to rotate the use, reducing the frequency of requests for a single IP.
With the widespread use of data scraping, many websites are aware of the need to protect their data from crawlers and bots. In order to prevent data from being crawled maliciously, these websites have adopted various anti-crawling measures, such as frequency restriction, captCHA verification, IP blocking, etc. Especially large websites, because they have a large number of important data resources and user information, the anti-crawling defense measures are more strict.
In the face of these complex anti-robot countermeasures, a smaller pool of agents may not be able to meet the demand. If only a limited number of proxy IP addresses are used for frequent requests, it is likely that the proxy IP will be blocked and the fetching task will be interrupted. To circumvent this, you need to build a larger proxy pool to ensure that each request can use a different proxy IP to access the target website.
By maintaining a large-scale proxy pool, proxy IP addresses can be rotated to reduce the request frequency of a single IP address and reduce the risk of being blocked. A proxy IP is randomly selected from the proxy pool for each request, making the volume of requests per IP relatively small and more difficult for websites to identify as abnormal behavior.
3, proxy IP type: The size of the proxy pool also depends on the type of proxy IP used, including data center IP, residential IP, or mobile IP. Different types of proxy IP addresses have different performance and stability. Therefore, you need to select an appropriate proxy IP address type and configure the scale of the proxy pool accordingly.
4, proxy IP quality: The size of the proxy pool is also related to the quality of the proxy IP used. Private private proxy IP addresses are generally more reliable and stable than shared proxy IP addresses, so larger proxy pools are required in scenarios that require high stability and privacy protection.
5, the complexity of the agent management system: The size of the agent pool is also affected by the complexity of the agent management system. The agent management system is responsible for agent rotation, throttling, session management and other operations. The complexity of these operations determines the effectiveness of the agent pool. An efficient proxy management system can make better use of proxy IP resources and improve the fetching efficiency and success rate.
In summary, the determinants of proxy pool size include the volume of requests per hour, the target website's adversarial strategy, the type and quality of the proxy IP, and the complexity of the proxy management system. The correct configuration of the proxy pool is crucial to ensure the stable and effective use of the proxy IP address, avoid being blocked by the target website, and ensure the smooth progress of the crawling task.