At present, data acquisition through web crawler has become the mainstream way of data acquisition. However, it is well known that a crawler needs to be used with a proxy IP, because if it is crawled directly, the crawler will soon be banned from the target server. However, in practice, many users found that even if they had used proxy IP, crawlers still could not access public data. This is usually because there is a problem with the proxy IP used by the user and it cannot meet the needs of the crawler. Generally speaking, crawling data has the following requirements for proxy IP:
High anonymity: The anonymity degree of proxy IP is divided into three categories: transparent proxy, ordinary anonymous proxy and high anonymous proxy. Transparent proxies do not protect the user's real IP address, and to the target server, the request appears to be coming directly from the user himself. An ordinary anonymous proxy can protect the IP address, and to the target server, the request appears to come from the proxy server rather than the user. However, the user's use of the proxy can still be detected because some HTTP headers reveal the presence of the proxy. Only high-secret agents can truly protect the IP address of the user, and they do not reveal any information related to the agent in the request.
In the current chaotic proxy market, many service providers call themselves "high hidden proxy IP", but they may actually provide ordinary anonymous or even transparent proxy. This misleading propaganda can lead users to believe that their real IP is adequately protected. Therefore, when choosing an agent service provider, users need to exercise caution and try to choose a well-known brand agent service provider. You can make an informed choice by looking at user reviews, consulting other users' experiences, and verifying that the proxy IP provided by the service provider is truly hidden.
Securing the user's IP address is critical to the crawler task. Using a high-hiding proxy IP ensures that the crawler is more concealable during data acquisition, reducing the risk of being identified and blocked by the target server. Therefore, in the proxy IP needs of users in crawlers, the importance of high hiding proxy cannot be ignored.
Rich IP resources: For crawler tasks, frequent IP address change is necessary, so the IP resources provided by the proxy service provider must be rich enough. If the IP resources are not sufficient, the crawler can easily use the IP address that has been used by other users when changing the IP address, which will cause the target server to easily identify the crawler and take measures such as banning, limiting the collection of data.
The IP resource richness provided by the agent service provider is closely related to its ability to meet the needs of crawlers. On the one hand, the richness of IP resources means that the crawler can choose more IP addresses for random switching, thus reducing the probability of being detected by the target server. On the other hand, the abundance of IP resources means that each IP address is used relatively infrequently, reducing the risk of crawler activity being identified by the target server.
When choosing a proxy service provider, users need to pay attention to the size and diversity of their IP resources. Larger service providers often have large IP pools and are able to provide more available IP addresses. At the same time, the diversity of IP resources includes different geographical locations and different types of IP, which is of great significance for simulating real user behavior and avoiding being blocked.
High stability: If there is a problem with the proxy server while the crawler is fetching data, the crawler will not be able to get a new available IP address. In this case, continuing the crawl operation will also be prohibited by the target server. Therefore, the proxy IP address used by the user must have high stability to minimize the occurrence of server faults.
To sum up, proxy IP plays an important role in crawlers. In order to carry out the crawling task smoothly and meet the demand of data acquisition, users need to choose a proxy service provider with high anonymity, rich IP resources and high stability. Only in this way can the crawler effectively use the proxy IP, protect the privacy of the user and smoothly obtain the required data.