How to Prevent servers from detecting real IP addresses

If you want to avoid detecting real IP addresses when you need to collect data, we plan to open up multiple threads at the same time to implement the IP address change every few minutes, but when using a free proxy IP address, the real IP address can be detected in the local test. I don't know if there are other ideas that can be avoided to detect real IP addresses?

Requirement
When collecting data, if you want to avoid detecting the real IP address, you are planning to open up multiple threads at the same time and change the IP address every few minutes, but when using the free proxy IP address, the real IP address can be detected in the local test.
I don't know if there are other ideas that can be avoided to detect real IP addresses?

Reply content:

Requirement
When collecting data, if you want to avoid detecting the real IP address, you are planning to open up multiple threads at the same time and change the IP address every few minutes, but when using the free proxy IP address, the real IP address can be detected in the local test.
I don't know if there are other ideas that can be avoided to detect real IP addresses?

Proxy is usually transparent, simple, anonymous, and highly anonymous. If you need to filter highly anonymous proxy ip addresses, you cannot find the real IP addresses through these proxies.

Both ends of the http protocol know the ip address of the other party. To hide the ip address, you can only set an anonymous proxy or vpn.

Try https://www.whonix.org/