URL Parse Split incorreclty interpret proxy pw, which include '?'

Hi,

I have exported the env var for http proxy, where the Username and password is included in the URL.
The password of the user includes an '?', which is the reason, why the URL string is not correctly processed.

The URL
http_proxy='http://<username>:<pass_with_?>@<server>:<port>'

When the method splits:
https://github.com/python/cpython/blob/53d9cd95cd91f1a291a3923acb95e0e86942291a/Lib/urllib/parse.py#L477

It splits at the ? of the password.

Therefore resulting into

 File "/usr/lib/python3/dist-packages/httplib2/__init__.py", line 950, in proxy_info_from_url
    port = int(port)
ValueError: invalid literal for int() with base 10: 'p'

if the URL would be:

http://user:p?assword@server:port

Regards
Nam

Comece em Lib/urllib/parse.py, no código de divisão de URL vinculado na issue, e reproduza o parsing de http://user:p?assword@server:port. Confirme o comportamento esperado para um ponto de interrogação nas credenciais do proxy e, em seguida, verifique se o exemplo não trata mais parte da senha como um componente separado da URL.