Cómo verificar si un proxy es válido (con un script listo)

#!/usr/bin/env bash
# proxy-check.sh — test proxies for liveness, latency and anonymity.
# Usage: bash proxy-check.sh proxies.txt   (one HOST:PORT per line, SOCKS5)
set -u
TARGET="https://api.ipify.org"
TIMEOUT=8

myip=$(curl -s --max-time "$TIMEOUT" "$TARGET")
echo "your real IP: $myip"
echo "-------------------------------------------"

while IFS= read -r proxy; do
  [ -z "$proxy" ] && continue
  start=$(date +%s.%N)
  out=$(curl -s --max-time "$TIMEOUT" --socks5-hostname "$proxy" "$TARGET")
  code=$?
  end=$(date +%s.%N)
  if [ $code -ne 0 ] || [ -z "$out" ]; then
    printf '%-22s DEAD\n' "$proxy"
    continue
  fi
  ms=$(awk "BEGIN{printf \"%d\", ($end-$start)*1000}")
  if [ "$out" = "$myip" ]; then
    printf '%-22s ALIVE %5sms  TRANSPARENT (leaks your IP!)\n' "$proxy" "$ms"
  else
    printf '%-22s ALIVE %5sms  OK exit=%s\n' "$proxy" "$ms" "$out"
  fi
done < "$1"

#!/usr/bin/env python3
"""proxy_check.py — validate proxies for liveness, latency and anonymity.
Usage: python3 proxy_check.py proxies.txt   (one HOST:PORT per line)
Requires: pip install "requests[socks]"
"""
import sys, time, requests

TARGET = "https://api.ipify.org"
TIMEOUT = 8

def real_ip():
    return requests.get(TARGET, timeout=TIMEOUT).text.strip()

def check(proxy, my_ip):
    proxies = {"http": f"socks5h://{proxy}", "https": f"socks5h://{proxy}"}
    t0 = time.perf_counter()
    try:
        exit_ip = requests.get(TARGET, proxies=proxies, timeout=TIMEOUT).text.strip()
    except Exception:
        return f"{proxy:22} DEAD"
    ms = int((time.perf_counter() - t0) * 1000)
    if exit_ip == my_ip:
        return f"{proxy:22} ALIVE {ms:5}ms  TRANSPARENT (leaks your IP!)"
    return f"{proxy:22} ALIVE {ms:5}ms  OK exit={exit_ip}"

def main():
    my_ip = real_ip()
    print("your real IP:", my_ip)
    print("-" * 43)
    with open(sys.argv[1]) as fh:
        for line in fh:
            p = line.strip()
            if p:
                print(check(p, my_ip))

if __name__ == "__main__":
    main()