代码如下： 
import httpx
import json
import random
import string
import time
import sys
import asyncio
from pathlib import Path
from datetime import datetime
from typing import List, Dict, Any, Optional
from fake_useragent import UserAgent
import requests

# 初始化UserAgent对象
ua = UserAgent()

class ProxyManager:
    """付费代理池管理器 - 支持API动态轮换"""
    
    def __init__(self):
        self.api_url = None
     ...