Dynamic proxy IP plays an important role in crawler and data acquisition. Before the use of dynamic proxy IP, many users habitually performed authentication, deleting invalid proxy IP with a long delay and retaining only valid proxy IP with a short delay and passed authentication. However, many users after verification, use these verified proxy IP, only to find that they do not work properly, which is why?
Reason 1: The verification URL is different
Third-party verification tools typically set up a simple web page to authenticate by connecting to a proxy IP address. Different tools may set different urls, which means that the proxy IP may be able to successfully access one website during authentication and pass the authentication, but it will not be able to access other different websites normally in the actual application.
In this case, even if the proxy IP address passes the authentication, it cannot be used in actual applications. This is because in actual crawling and data collection work, users may need to visit multiple different target websites, and different websites may have different anti-crawling policies and access restrictions. Therefore, just because a proxy IP is validated on one site does not mean it will work on other sites.
Cause two: Concurrency and latency
Setting the number of concurrent threads and the authentication timeout is an important consideration when performing proxy IP authentication. This is to prevent account association and improve verification efficiency. Concurrent threads refer to the number of threads authenticating at the same time, that is, the ability to authenticate multiple proxy IP addresses simultaneously. The validation timeout is the maximum time to wait for a response while validation is performed, beyond which the proxy IP will be considered invalid.
When the concurrent threads are set to be large, the validation speed becomes faster because verifying multiple proxy IP addresses at the same time can result in faster validation results. However, this can also lead to less efficient verification of proxy IP. This is because too many concurrent requests may bring a greater burden to the target website, which may be regarded as malicious access and be restricted or blocked, resulting in the proxy IP cannot be used normally in practical applications.
①Solve the crawler IP problem with high repetition rate
Conversely, if you set concurrent threads to be small, validation will slow down accordingly. However, this has the advantage of increasing the efficiency of verifying the proxy IP. By reducing the number of concurrent requests, the burden of the target website is reduced, and the probability of being identified as malicious access is reduced, thus improving the success rate of proxy IP in practical applications.
Therefore, although the proxy IP passes the authentication at the time of authentication, it may not be used properly in real applications due to concurrency and latency Settings. To solve this problem, users can adjust concurrent threads and validation timeouts based on the target site's anti-crawling policies and access restrictions to find the most appropriate validation Settings for the target site. At the same time, users can also try to use a variety of different authentication Settings and proxy IP to increase the applicability and success rate of proxy IP in different scenarios. Comprehensive consideration and adjustment of authentication Settings can improve the actual use of proxy IP.
Cause three: The proxy IP address authorization is faulty
Quality proxy IP service providers usually manage their proxy IP authorization to ensure that their customers can use the proxy IP properly and securely. This authorization usually involves binding IP whitelists and verifying account secrets.
First, the proxy IP server will ask the customer to add their IP address to the whitelist of the proxy IP. A whitelist is a list of IP addresses that are allowed to access proxy IP addresses. By adding their IP addresses to the whitelist, customers can be authorized to use proxy IP services. However, if the customer does not add its IP address to the whitelist correctly, the proxy IP service provider will not be able to identify the customer, resulting in the proxy IP not working properly in practical applications.
②Solve the crawler IP problem with high repetition rate
Therefore, if the authenticated proxy IP address cannot be used in actual applications, you must first check whether you have added your own IP address to the whitelist of the proxy IP address, and ensure that you provide the correct authorization account and secret. If the authorization information is incorrect or authorization is not performed, the proxy IP will not work properly, even if it passes the test during verification.
To sum up, although the dynamic proxy IP may pass the detection during authentication, it may not be used normally in practical applications due to different authentication urls, concurrency and delay Settings, and proxy IP authorization issues. Therefore, when selecting and using proxy IP, users need to consider various factors comprehensively to ensure the selection of stable and effective proxy IP to meet the needs of their crawling and data collection work.
