用于网页爬虫的代理，支持加密货币支付且无需KYC

import random
import time
import requests

GATEWAY = "gw.namelessproxy.com:7777"
USERNAME, PASSWORD = "USERNAME", "PASSWORD"
RETRY_CODES = {403, 429, 500, 502, 503, 504}
HEADERS = {"User-Agent": "PriceResearchBot/1.0 (+https://example.com/bot)"}

def fetch(url, country="ke", tries=4):
    proxy = f"http://{USERNAME}-country-{country}:{PASSWORD}@{GATEWAY}"
    for attempt in range(tries):
        try:
            r = requests.get(url, proxies={"http": proxy, "https": proxy},
                             headers=HEADERS, timeout=30)
            if r.status_code not in RETRY_CODES:
                return r
            ra = r.headers.get("Retry-After", "")
            wait = int(ra) if ra.isdigit() else 0
        except requests.RequestException:
            wait = 0
        # New connection on retry = new exit IP
        time.sleep(max(wait, 2 ** attempt + random.random()))
    raise RuntimeError(f"giving up on {url}")

print(fetch("https://example.com/").status_code)

# middlewares.py
GATEWAY = "gw.namelessproxy.com:7777"
USERNAME, PASSWORD = "USERNAME", "PASSWORD"

class NamelessProxyMiddleware:
    def process_request(self, request, spider):
        user = f"{USERNAME}-country-{request.meta.get('country', 'eg')}"
        session = request.meta.get("session")  # same value = same exit IP
        if session:
            user += f"-session-{session}-ttl-10"
        request.meta["proxy"] = f"http://{user}:{PASSWORD}@{GATEWAY}"

# settings.py
ROBOTSTXT_OBEY = True
CONCURRENT_REQUESTS_PER_DOMAIN = 4
AUTOTHROTTLE_ENABLED = True
RETRY_TIMES = 3
RETRY_HTTP_CODES = [403, 429, 500, 502, 503, 504]
DOWNLOADER_MIDDLEWARES = {
    "myproject.middlewares.NamelessProxyMiddleware": 350,  # runs before HttpProxyMiddleware (750)
}