The ultimate test for a scraper: Can this proxy load https://www.google.com without a CAPTCHA? If not, discard it.
If you need to scrape 10 million product pages from Amazon or Google Search results, you cannot use 10 proxies. You need thousands of rotating IPs to avoid rate limiting and IP bans. 1 million proxy list txt free
But does a clean, usable, free list of one million proxies actually exist? And if it does, should you use it? The ultimate test for a scraper: Can this
A million-proxy list increases your chances of finding obscure geographic locations—specific cities in Brazil, Russia, or Indonesia—that standard VPNs don't offer. You need thousands of rotating IPs to avoid
Do not use ICMP ping (many servers block it). Use nc (netcat) or a TCP connection test. A Python script using socket can test 1,000 proxies per second.