尽管凭据正确，但仍需要“ 407代理身份验证”

Question

我正在尝试运行此代码

import requests

proxy_username = "MY_USERNAME"
proxy_password = "MY_PASSWORD"

url="https://onlinelibrary.wiley.com/journal/10970266"

proxies = { 'https' : f'https://{proxy_username}:{proxy_password}@PROXY_IP:PROXY_PORT' } 
print(proxies)

resp = requests.get(url, proxies=proxies)

print(resp.text)

但这给了我所需的407代理身份验证：

requests.exceptions.ProxyError: HTTPSConnectionPool(host='onlinelibrary.wiley.com', port=443): Max retries exceeded with url: /journal/10970266 (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy Authentication Required')))

我确定凭据正确无误。我在做什么错了？