How do web crawlers use proxy services?

1. Obtain IP directly by invoking the interface and purchase IP from the IP proxy service provider.

For example, IPIDEA contains global dynamic and static IP, login background management, API interface can be generated, API interface can be connected in the program code, and proxy IP can be used by calling API interface. But the API interface has a minimum call frequency, such as 10 seconds, 1 second, 1 second, etc. You need to follow this rule when calling API interfaces.

2. Create a local IP address pool and obtain IP addresses periodically.

Because the frequency of calls to obtain IP directly from the proxy IP service provider's interface is minimal, there are several programs that can obtain IP continuously. Then, you can set up a local IP address pool, obtain IP addresses periodically from the API of the proxy IP service provider, and add them to the local IP address pool after authentication. Then, you can obtain proxy IP addresses continuously through the API of the local IP address pool.

3. Use dynamic forwarding to automatically switch the proxy IP address.

Some people think that it is troublesome to maintain the proxy IP address pool, so they choose to use dynamic forwarding. Fixed IP addresses and ports are set as proxy servers, and IP addresses can be randomly switched each time.

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