GitHub is the #1 source for proxy lists. Search for reflect4-proxy-list or free-proxy-list reflect4.

While "free" is an attractive price tag, using public proxy lists like Reflect4 carries inherent risks. Here is how to mitigate them:

1. Reliability and Speed Free proxies are notoriously slow and unstable. They are often hosted on residential computers with limited bandwidth or are overloaded with users.

2. Security Risks When you use a proxy, you are routing your traffic through a third-party server. Malicious proxy operators can intercept your data, log your browsing history, or inject malware.

3. IP Leaks Some free proxies are configured incorrectly and may leak your real IP address via WebRTC or DNS requests.

Free lists are slow. Use httpx or curl with a timeout of 5 seconds.

curl -x http://proxy-ip:port -s -o /dev/null -w "%time_total\n" https://google.com

If the response time is > 3 seconds, discard it.

import requests
import random

Free proxies have limited bandwidth. Sending 1,000 requests per second will crash the proxy server and expose your real IP due to TCP timeouts. Add time.sleep(random.uniform(1, 3)) between requests.