Proxy tunneling failed

Proxy tunneling failed

$ python -c "import requests; requests.get('https://example.com', proxies={'https':'http://proxy:8080'})"
Traceback (most recent call last):
  ...
urllib3.exceptions.ProxyError: ('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy Authentication Required'))

Why this happens

The proxy requires authentication or blocks the CONNECT request to the destination.

Fix

• Provide valid proxy credentials.
• Allow the destination in proxy ACLs.

Wrong code

import requests
proxies = {"https": "http://proxy.example:8080"}
requests.get("https://example.com", proxies=proxies)

Fixed code

import requests
proxies = {"https": "http://user:[email protected]:8080"}
resp = requests.get("https://example.com", proxies=proxies)
print(resp.status_code)