使用云前端拒绝访问签名的URL Python3

import hashlib
import hmac
import base64
import urllib.parse

def generate_signed_url(url, access_key, secret_key):
    # 生成签名
    timestamp = str(int(time.time()))
    message = timestamp + url
    signature = base64.b64encode(hmac.new(secret_key.encode(), message.encode(), hashlib.sha1).digest()).decode()

    # 构造带签名的URL
    signed_url = url + "?access_key=" + urllib.parse.quote(access_key) + "&timestamp=" + timestamp + "&signature=" + urllib.parse.quote(signature)
    return signed_url

# 示例用法
url = "https://example.com/resource"
access_key = "your_access_key"
secret_key = "your_secret_key"
signed_url = generate_signed_url(url, access_key, secret_key)
print(signed_url)