6,604,587 IPs
For users who are new to crawlers, they are often unsure whether the proxy IP they have obtained is valid or whether the proxy IP they have set has taken effect. In fact, it is not difficult to determine whether the proxy IP is valid. Naproxy Overseas IP Proxy summarizes some effective methods to help users determine whether the proxy IP is valid.
Ⅰ.What is the connection between crawler technology and IP agent and how to solve IP
1. Observe the terminal IP authorization prompt to determine whether the proxy IP address takes effect
When using the proxy IP service, when we bind the terminal IP authorization or switch the authorization mode, the system usually provides the corresponding prompt, such as "The setting is successful, it will take effect in about ** minutes" or "The mode is successfully switched, it will take effect in ** minutes". While many novice users will focus on the time in the prompt, there are actually some steps we can take to verify that the proxy IP has taken effect.
First, after the scheduled time is reached, we can extract the proxy IP and try to connect. If the connection is successful, you can confirm that the proxy IP address has taken effect and continue to work using the proxy IP address. However, if you experience a 407 error during the connection process, there may be a problem with the authorization or authorization Settings, such as binding a non-fixed terminal IP. In this case, we need to double-check the authorization Settings to ensure that the authorization is in effect and configured correctly.
In addition, we can further verify the validity of the proxy IP by:
Web browsing with a proxy IP: After setting a proxy IP, open a browser and visit a commonly used website, such as Google or Baidu. If the page loads normally and the content displayed is different from the actual location, the proxy IP address has taken effect.
IP lookup using network tools: With some online IP lookup tools, we can check whether the IP address currently used is the same as the proxy IP address set. If the displayed IP address matches the proxy IP set, you can confirm that the proxy IP has taken effect.
Ⅱ.What should I pay attention to when using IP proxy for web crawler?
Network access speed test: When using a proxy IP for network access, we can evaluate the access speed through the network speed test tool. If the access speed increases significantly or as expected, then the proxy IP is most likely in effect.
2. Use API to extract proxy IP and verify validity
Many people are used to extracting a batch of proxy IP through the API and verifying their validity. This practice increases productivity by keeping only valid proxy IP addresses for use while weeding out invalid ones. It is not difficult to determine whether the proxy IP is valid. We can write code to request a very simple URL and judge the validity of the proxy IP based on the result of the request.
First, we need to extract a batch of proxy IP from a trusted proxy IP service provider or website. These proxy IP addresses are usually provided in the form of apis, and we can get a list of proxy IP addresses through API calls. When extracting proxy IP addresses, you can set some filtering conditions based on your requirements, such as the type, region, and speed of proxy IP addresses, to obtain a list of proxy IP addresses that meet your requirements.
Next, we need to write code to verify the validity of the proxy IP. Usually, we can choose a very simple URL, such as a static page, as the target of verification. Then, using the programming language's HTTP request library, the request is sent to the destination URL over the proxy IP.
If the request is successful, that is, the content of the target URL is returned or the response code is 200, then the proxy IP can be determined to be valid. This means that the proxy IP is able to connect to the target website properly and can get the page content correctly.
However, if the request fails, such as if the content returned is empty or the response code is not 200, then the proxy IP may not be valid. The proxy IP address may fail to connect to the target website, be blocked by the target website, or the proxy IP address has expired.
By verifying a batch of proxy IP addresses one by one, we can screen out valid proxy IP addresses and reserve them for use, while weeding out invalid proxy IP addresses to ensure the smooth progress of subsequent work.
Check the website and IP visited: For users who have obtained and verified the proxy IP, they may not be sure whether the proxy IP set is valid and whether they are accessing the website through the proxy IP or using the local IP. This can be judged by visiting some websites that view IP. Before accessing a website using a proxy IP, we can visit these websites to see if the returned IP is a local IP or a set proxy IP. The results will be clear. Users who use a proxy IP through program code usually first request a very simple website or interface that looks at the IP to determine whether the proxy IP was successfully connected.
These are some effective ways to determine whether the proxy IP is valid. Hopefully, these methods will be helpful for novice users. By correctly determining the validity and effectiveness of the proxy IP address, you can apply the proxy IP address more accurately and improve work efficiency.
