Better use of proxies for crawler data collection?
In daily network work, many network workers need to use proxies to help complete tasks, such as common crawler work, marketing posts, online voting, effect supplement and so on. Some people use third-party tools, others write their own code programs, automatically call through the docking application interface to obtain IP, and then complete the work.When working with an proxy, you often encounter problems such as the software does not work, all the proxy IP fails, and the return result is empty after the code runs. Such prompt results do not know where the problem is, and do not know where to start if you want to solve the problem.Many friends are very worried. Once they can't use it, they think there is a problem with the proxy IP and continue to use it. The result is the same. In case of such a problem, don't worry. First find out the root of the problem and then solve it.First, whether the API withdrawal link is normal and whether the proxy IP can withdraw normally. The first step of many software is set incorrectly, and the IP cannot be withdrawn at all, or the API return format does not meet the requirements. There are also many friends whose code processing IP partition is incorrect. There were several friends who used the proxy IP for the first time, and all subsequent uses failed, After repeated inspection, it was found that the partition treatment was incorrect.So, how to determine whether there is a problem with API extraction links? In fact, after copying the API extraction link to the browser bar and opening it, you can see the results: 1. The web page cannot be opened, there is a problem with the API. 2. Return to the IP normally, and check whether the format meets the requirements. 3. It cannot be returned normally for other reasons, insufficient parameters or too fast extraction.Second, whether the proxy IP license is correct. Many paid proxy IP now need a license, which is more secure. At present, there are three mainstream licensing methods: 1. White list; 2. User name + password; 3.1 and 2 support, which can be switched automatically. If the API fails to extract IP proxies, it is necessary to check the authorization. For example, in the IP white list authorization mode, whether the fixed proxy terminal IP is bound; Whether the authorization is correct under user name + password authorization; Whether authorization is confused in the two authorization modes.So how to judge authorization errors? It's actually very simple: 1. Log in to the proxy IP website management background and check directly. 2. Set the proxy IP test in the browser. The terminal IP white list authorization mode or user name + password authorization mode is not bound. After the browser sets the proxy IP, the user name + password dialog box will pop up, requiring the user name and password to be entered; 3. The code has 7 errors.There are many questions about whether the anti crawling strategy is correct. Obviously, everything is set, and the code is also right, but the access fails, or the success rate is low. Some of the previous accesses succeed, and suddenly one day the access fails, or fails. The first reaction of many friends is that the proxy IP quality is poor and has declined. At this time, it can be solved by replacing the proxy server. Roxlabs provides global mixed residential IP with a business success rate of 100%. New users can register to receive trial opportunities.
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