ProxyError when email is username in proxy authentication

[gandraman]

• pip version: 19.0.3
• Python version: 3.8.5
• Operating system: Windows 10

Hi guys,

I tried several posts related to this topic, but maybe this issue is specific, due to the format of my proxy username which is in form "myname@corporatedomain:[email protected]." I always get:

Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy authentication required'))'

I was using different variations of the command:

pip3.exe install -r requirements.txt --proxy=http://[email protected]:mypasswordwith.@corporateproxy:8080
pip3.exe install -r requirements.txt --proxy=http://myname%40corporatedomain.com:mypasswordwith%2e@corporateproxy:8080
pip3.exe install -r requirements.txt --proxy="http://[email protected]:mypasswordwith.@corporateproxy:8080"
pip3.exe install -r requirements.txt --proxy="http://myname%40corporatedomain.com:mypasswordwith%2e@corporateproxy:8080"

I also tried with setting up global environment variables in Windows - it doesn't work.
At the same time, I tested proxy from PyCharm (but that parameter doesn't seem to be used by pip anymore) and the connection test works.

Do you know if I am missing something here? I somehow assume that it has something to with special characters or similar, as this used to worklong time ago on this same machine...

Thanks in advance!
Dragan

[gandraman]

I've just tested connection using curl and proxy authentication. I get the same error:
curl: (56) Received HTTP code 407 from proxy after CONNECT

I only don't get it when trying to reach google, so there is definitely something related to HTTP proxy, although I am not sure why it works from browsers...

[uranusjr]

Not really a pip issue at this point, but maybe the proxy is checking the user-agent?

[gandraman]

Hi @uranusjr ,

I've tried putting user-agent header inside curl request, but I get the same unfortunately, so this probably wouldn't help by inserting into pip request either, but thanks for the suggestion! This is what i tried:

curl -u mycorporateemail:mypassword -x http://corporateproxy:8080 -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36" https://pypi.org/

curl: (56) Received HTTP code 407 from proxy after CONNECT