pip: Support for web proxies is broken in pip 20.3

Environment

pip version: 20.3
Python version: 3.9.1rc1
OS: Windows 10 Enterprise Version 1909 (64-bit)

I am behind a corporate firewall with an authenticating proxy that requires both a user ID and a password.

Description

pip 20.2.4 supported the proxy but pip 20.3 does not. I tried both setting the environment variables and using the --proxy command line argument, but neither worked in pip 20.3. pip 20.2.4 works fine even if no --proxy argument is used and no proxy-related environment variables are set.

Expected behavior

pip 20.3 should support the proxy in the same way that pip 20.2.4 does.

How to Reproduce

See the output below. I set up a virtual environment, and updated pip to version 20.2.4, demonstrated that there was no bug, then updated pip to version 20.3 and demonstrated the bug

Output

Paste the output of the steps above, including the commands themselves and
pip's output/traceback etc.

C:\MISC>mkdir pipbug

C:\MISC>cd pipbug

C:\MISC\pipbug>python -m venv pipbug

C:\MISC\pipbug>dir
 Volume in drive C is Windows
 Volume Serial Number is 0CB7-E951

 Directory of C:\MISC\pipbug

11/30/2020  02:57 PM    <DIR>          .
11/30/2020  02:57 PM    <DIR>          ..
11/30/2020  02:57 PM    <DIR>          pipbug
               0 File(s)              0 bytes
               3 Dir(s)  122,653,765,632 bytes free

C:\MISC\pipbug>pipbug\Scripts\activate

(pipbug) C:\MISC\pipbug>pip list
Package    Version
---------- -------
pip        20.2.3
setuptools 49.2.1
WARNING: You are using pip version 20.2.3; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>python -m pip install -U "pip<20.3"
Collecting pip<20.3
  Using cached pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.3
    Uninstalling pip-20.2.3:
      Successfully uninstalled pip-20.2.3
Successfully installed pip-20.2.4

(pipbug) C:\MISC\pipbug>pip install -U setuptools wheel
Collecting setuptools
  Using cached setuptools-50.3.2-py3-none-any.whl (785 kB)
Collecting wheel
  Using cached wheel-0.35.1-py2.py3-none-any.whl (33 kB)
Installing collected packages: setuptools, wheel
  Attempting uninstall: setuptools
    Found existing installation: setuptools 49.2.1
    Uninstalling setuptools-49.2.1:
      Successfully uninstalled setuptools-49.2.1
Successfully installed setuptools-50.3.2 wheel-0.35.1
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>pip list
Package    Version
---------- -------
pip        20.2.4
setuptools 50.3.2
wheel      0.35.1
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>pip list -o
Package Version Latest Type
------- ------- ------ -----
pip     20.2.4  20.3   wheel
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>REM Call proxies.bat to set environment variables for proxy.

(pipbug) C:\MISC\pipbug>REM Certain items (<user>, <password>, and <domain>) have been redacted.

(pipbug) C:\MISC\pipbug>proxies <password>

(pipbug) C:\MISC\pipbug>set PIP_PROXY=http://<user>:<password>@proxy-west.<domain>.org:8080/

(pipbug) C:\MISC\pipbug>set FTP_PROXY=ftp://<user>:<password>@proxy-west.<domain>.org:8080/

(pipbug) C:\MISC\pipbug>set http_proxy=http://<user>:<password>@proxy-west.<domain>.org:8080/

(pipbug) C:\MISC\pipbug>set https_PROXY=https://<user>:<password>@proxy-west.<domain>.org:8080/

(pipbug) C:\MISC\pipbug>c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip
Collecting pip
  Using cached pip-20.3-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.4
    Uninstalling pip-20.2.4:
      Successfully uninstalled pip-20.2.4
Successfully installed pip-20.3

(pipbug) C:\MISC\pipbug>pip list -o
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/

(pipbug) C:\MISC\pipbug>pip list -o --use-deprecated=legacy-resolver
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/

(pipbug) C:\MISC\pipbug>pip list -o --proxy <user>:<password>@proxy-west.<domain>.org:8080
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/

(pipbug) C:\MISC\pipbug>python -m pip install -U "pip<20.3"
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
ERROR: Could not find a version that satisfies the requirement pip<20.3
ERROR: No matching distribution found for pip<20.3

(pipbug) C:\MISC\pipbug>dir \misc\*pip*.py
 Volume in drive C is Windows
 Volume Serial Number is 0CB7-E951

 Directory of C:\misc

11/30/2020  09:46 AM         1,910,500 get-pip.py
05/14/2016  05:43 AM               805 piplist.py
               2 File(s)      1,911,305 bytes
               0 Dir(s)  122,641,879,040 bytes free

(pipbug) C:\MISC\pipbug>python c:\misc\get-pip.py "pip<20.3"
Collecting pip<20.3
  Using cached pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.3
    Uninstalling pip-20.3:
      Successfully uninstalled pip-20.3
Successfully installed pip-20.2.4

(pipbug) C:\MISC\pipbug>pip list -o
Package Version Latest Type
------- ------- ------ -----
pip     20.2.4  20.3   wheel
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>deactivate
C:\MISC\pipbug>

About this issue

Original URL
State: closed
Created 4 years ago
Reactions: 2
Comments: 23 (12 by maintainers)

Links to this issue

kerberos - Alternative to cntlm to authenticate behind corporate proxy - Stack Overflow

Most upvoted comments

@tomerv I have found the problem. It’s actually within pip at pi\_internal\network\session.py in the method PipSession().request() line 419

I’m using pip 21.0.1 to debug.

The problem is caused because the proxy set by --proxy in the pip method is not being passed corrected to the request of urllib package.

This is the original request method of PipSession:

def request(self, method, url, *args, **kwargs):
        # Allow setting a default timeout on a session
        kwargs.setdefault("timeout", self.timeout)
        
        # Dispatch the actual request
        return super().request(method, url, *args, **kwargs)

If you make a breakpoint there you gonna see that self.proxies is corrected setted from --proxies, however, when the call to the parent class is made the proxies get lost and urllib set it from the system, which then gets the wrong scheme (https instead of http).

An easy fix I suggest is to add the following line at the request method in the file pi\_internal\network\session.py, line 419:

def request(self, method, url, *args, **kwargs):
     # Allow setting a default timeout on a session
     kwargs.setdefault("timeout", self.timeout)
     kwargs.setdefault("proxies", self.proxies)  # fix problem with proxies.

    # Dispatch the actual request
    return super().request(method, url, *args, **kwargs)

This way the proxies are carried out correctly to the request, if no proxy is set an empty dict is passed.

So now if you run pip install package --proxy http://proxy_ip everything works as expected.

I hope this will help to remove this bug in next versions of pip asap.

junqfisica on Mar 3, 2021

The new flow for tls_in_tls_required is at fault - introduced in https://github.com/pypa/pip/commit/e76b1ddeaa3694ae87df577c751ba7d9d36b4771

Removing these 2 lines makes everything work again:

        if self.proxy.scheme == "https":
            conn.tls_in_tls_required = True

I have no idea what’s the purpose of this, and I couldn’t find any explanation in the code or the commit message. This also explains @GreggMidon 's comment above:

I got the above error with —proxy set to our “https” proxy URL. Changed it to “http” and it works fine.

EDIT: I now think that the code is fine, even if a bit unclear. Changing the proxy from “https” to “http” is the correct solution.

tomerv on Mar 1, 2021

One way to verify this would be to run requests.get("https://pypi.org/simple/pip/") behind the proxy and see what happens.

pip 20.3 uses the following versions:

https://github.com/pypa/pip/blob/30eeb9ceb10bf76316f091e8615a9c3d8025fff0/src/pip/_vendor/vendor.txt#L14-L18

pip 20.2.4:

https://github.com/pypa/pip/blob/57dd580f582f33310f1c53cca2af2255985425d2/src/pip/_vendor/vendor.txt#L14-L18

uranusjr on Dec 3, 2020

Here is the requested output. I have removed more than 1000 uninteresting lines.

C:\MISC>cd pipbug

C:\MISC\pipbug>pipbug\Scripts\activate

(pipbug) C:\MISC\pipbug>pip list
Package    Version
---------- -------
pip        20.2.4
setuptools 50.3.2
wheel      0.35.1
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>pip list -o -v
1 location(s) to search for versions of setuptools:
* https://pypi.org/simple/setuptools/
1 location(s) to search for versions of wheel:
* https://pypi.org/simple/wheel/
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/wheel/
Fetching project page and analyzing links: https://pypi.org/simple/setuptools/
Getting page https://pypi.org/simple/setuptools/
Getting page https://pypi.org/simple/wheel/
Getting page https://pypi.org/simple/pip/
Found index url https://pypi.org/simple
Found index url https://pypi.org/simple
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/setuptools/" in the cache
Looking up "https://pypi.org/simple/wheel/" in the cache
Request header has "max_age" as 0, cache bypassed
Looking up "https://pypi.org/simple/pip/" in the cache
Request header has "max_age" as 0, cache bypassed
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
Starting new HTTPS connection (2): pypi.org:443
Starting new HTTPS connection (3): pypi.org:443
https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 304 0
https://pypi.org:443 "GET /simple/setuptools/ HTTP/1.1" 304 0
https://pypi.org:443 "GET /simple/wheel/ HTTP/1.1" 304 0
[1345 links were listed; I have removed most of them]
  Found link https://files.pythonhosted.org/packages/51/15/d31364732deb6e7d1490f8a08f011997b52b4b106d592d36e917404be613/wheel-0.1.tar.gz#sha256=2cc0dd3d9465ae323ad6e85fc9dc54ab3664da2c60ce42189b9ae4c44de7d8bd (from https://pypi.org/simple/wheel/), version: 0.1
  ...
  Found link https://files.pythonhosted.org/packages/3d/9d/1e313763bdfb6a48977b65829c6ce2a43eaae29ea2f907c8bbef024a7219/pip-0.2.tar.gz#sha256=88bb8d029e1bf4acd0e04d300104b7440086f94cc1ce1c5c3c31e3293aee1f81 (from https://pypi.org/simple/pip/), version: 0.2
  ...
  Skipping link: none of the wheel's tags match: py27-none-any: https://files.pythonhosted.org/packages/0b/86/3c1687aba2d15cec12ed2dc9bb5276e9fb6d3d43ce7376e91fabdb400c0a/wheel-0.8-py27-none-any.whl#sha256=583831383bdf191fac1953595b8d9ec704718eb22e322b6fd4e9449aacd91f2b (from https://pypi.org/simple/wheel/)
  ...
  Skipping link: none of the wheel's tags match: py27-none-any: https://files.pythonhosted.org/packages/98/53/d87853d5490feb0ec9295e645ce0fa631ed95c2020d3411103561563e045/wheel-0.9-py27-none-any.whl#sha256=c989d0fa556621341d46167389496e5c9191b5c4eb5a70d1190c473207ddd9c8 (from https://pypi.org/simple/wheel/)
  ...
  Skipping link: unsupported archive format: .egg: https://files.pythonhosted.org/packages/77/38/90cae8fd99c5dc402d25930e1c91f5fcf6de5c8e982fd152a5a061e3df56/setuptools-0.6b1-py2.3.egg#sha256=ae0a6ec6090a92d08fe7f3dbf9f1b2ce889bce2a3d7724b62322a29b92cf93f0 (from https://pypi.org/simple/setuptools/)
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Package Version Latest Type  Location                                Installer
------- ------- ------ ----- --------------------------------------- ---------
pip     20.2.4  20.3   wheel c:\misc\pipbug\pipbug\lib\site-packages pip
WARNING: You are using pip version 20.2.4; however, version 20.3 is available.
You should consider upgrading via the 'c:\misc\pipbug\pipbug\scripts\python.exe -m pip install --upgrade pip' command.

(pipbug) C:\MISC\pipbug>python -m pip install -v -U pip
Using pip 20.2.4 from C:\MISC\pipbug\pipbug\lib\site-packages\pip (python 3.9)
Non-user install because user site-packages disabled
Created temporary directory: C:\Users\<user>\AppData\Local\Temp\pip-ephem-wheel-cache-lyndid24
Created temporary directory: C:\Users\<user>\AppData\Local\Temp\pip-req-tracker-m4sqqlee
Initialized build tracking at C:\Users\<user>\AppData\Local\Temp\pip-req-tracker-m4sqqlee
Created build tracker: C:\Users\<user>\AppData\Local\Temp\pip-req-tracker-m4sqqlee
Entered build tracker: C:\Users\<user>\AppData\Local\Temp\pip-req-tracker-m4sqqlee
Created temporary directory: C:\Users\<user>\AppData\Local\Temp\pip-install-bkx42cyi
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/pip/
Getting page https://pypi.org/simple/pip/
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/pip/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 304 0
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Given no hashes to check 153 links for project 'pip': discarding no candidates
Using version 20.3 (newest of versions: 0.2, 0.2.1, 0.3, 0.3.1, 0.4, 0.5, 0.5.1, 0.6, 0.6.1, 0.6.2, 0.6.3, 0.7, 0.7.1, 0.7.2, 0.8, 0.8.1, 0.8.2, 0.8.3, 1.0, 1.0.1, 1.0.2, 1.1, 1.2, 1.2.1, 1.3, 1.3.1,1.4, 1.4.1, 1.5, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 6.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.1.0, 6.1.1, 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.1.0, 7.1.1, 7.1.2, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.1.0, 8.1.1, 8.1.2, 9.0.0, 9.0.1, 9.0.2, 9.0.3, 10.0.0, 10.0.1, 18.0, 18.1, 19.0, 19.0.1, 19.0.2, 19.0.3, 19.1, 19.1.1, 19.2, 19.2.1, 19.2.2, 19.2.3, 19.3, 19.3.1, 20.0, 20.0.1, 20.0.2, 20.1, 20.1.1, 20.2, 20.2.1, 20.2.2, 20.2.3, 20.2.4, 20.3)
Given no hashes to check 153 links for project 'pip': discarding no candidates
Using version 20.3 (newest of versions: 0.2, 0.2.1, 0.3, 0.3.1, 0.4, 0.5, 0.5.1, 0.6, 0.6.1, 0.6.2, 0.6.3, 0.7, 0.7.1, 0.7.2, 0.8, 0.8.1, 0.8.2, 0.8.3, 1.0, 1.0.1, 1.0.2, 1.1, 1.2, 1.2.1, 1.3, 1.3.1,1.4, 1.4.1, 1.5, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 6.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.1.0, 6.1.1, 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.1.0, 7.1.1, 7.1.2, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.1.0, 8.1.1, 8.1.2, 9.0.0, 9.0.1, 9.0.2, 9.0.3, 10.0.0, 10.0.1, 18.0, 18.1, 19.0, 19.0.1, 19.0.2, 19.0.3, 19.1, 19.1.1, 19.2, 19.2.1, 19.2.2, 19.2.3, 19.3, 19.3.1, 20.0, 20.0.1, 20.0.2, 20.1, 20.1.1, 20.2, 20.2.1, 20.2.2, 20.2.3, 20.2.4, 20.3)
Collecting pip
  Created temporary directory: C:\Users\<user>\AppData\Local\Temp\pip-unpack-kza6vp1o
  Looking up "https://files.pythonhosted.org/packages/55/73/bce122d1ed0217b3c1a3439ab16dfa94bbeabd0d31755fcf907493abf39b/pip-20.3-py2.py3-none-any.whl" in the cache
  Current age based on date: 29944
  Ignoring unknown cache-control directive: immutable
  Freshness lifetime from max-age: 365000000
  The response is "fresh", returning cached response
  365000000 > 29944
  Using cached pip-20.3-py2.py3-none-any.whl (1.5 MB)
  Added pip from https://files.pythonhosted.org/packages/55/73/bce122d1ed0217b3c1a3439ab16dfa94bbeabd0d31755fcf907493abf39b/pip-20.3-py2.py3-none-any.whl#sha256=3236fe7288d155c238bb6c85d3e784db3a8e592e827b83fea4d36d8b749ecc4b to build tracker 'C:\\Users\\<user>\\AppData\\Local\\Temp\\pip-req-tracker-m4sqqlee'
  Removed pip from https://files.pythonhosted.org/packages/55/73/bce122d1ed0217b3c1a3439ab16dfa94bbeabd0d31755fcf907493abf39b/pip-20.3-py2.py3-none-any.whl#sha256=3236fe7288d155c238bb6c85d3e784db3a8e592e827b83fea4d36d8b749ecc4b from build tracker 'C:\\Users\\<user>\\AppData\\Local\\Temp\\pip-req-tracker-m4sqqlee'
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.2.4
    Uninstalling pip-20.2.4:
      Created temporary directory: C:\MISC\pipbug\pipbug\Lib\site-packages\~ip-20.2.4.dist-info
      Removing file or directory c:\misc\pipbug\pipbug\lib\site-packages\pip-20.2.4.dist-info\
      Created temporary directory: C:\MISC\pipbug\pipbug\Lib\site-packages\~ip
      Removing file or directory c:\misc\pipbug\pipbug\lib\site-packages\pip\
      Created temporary directory: C:\Users\<user>\AppData\Local\Temp\pip-uninstall-b1845kuf
      Removing file or directory c:\misc\pipbug\pipbug\scripts\pip.exe
      Removing file or directory c:\misc\pipbug\pipbug\scripts\pip3.9.exe
      Removing file or directory c:\misc\pipbug\pipbug\scripts\pip3.exe
      Successfully uninstalled pip-20.2.4

Successfully installed pip-20.3
Removed build tracker: 'C:\\Users\\<user>\\AppData\\Local\\Temp\\pip-req-tracker-m4sqqlee'

(pipbug) C:\MISC\pipbug>pip list -o -v
1 location(s) to search for versions of setuptools:
* https://pypi.org/simple/setuptools/
1 location(s) to search for versions of wheel:
* https://pypi.org/simple/wheel/
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/setuptools/
Fetching project page and analyzing links: https://pypi.org/simple/wheel/
Fetching project page and analyzing links: https://pypi.org/simple/pip/
Getting page https://pypi.org/simple/setuptools/
Getting page https://pypi.org/simple/wheel/
Getting page https://pypi.org/simple/pip/
Found index url https://pypi.org/simple
Found index url https://pypi.org/simple
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/wheel/" in the cache
Looking up "https://pypi.org/simple/setuptools/" in the cache
Looking up "https://pypi.org/simple/pip/" in the cache
Request header has "max_age" as 0, cache bypassed
Request header has "max_age" as 0, cache bypassed
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
Starting new HTTPS connection (2): pypi.org:443
Starting new HTTPS connection (3): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
Starting new HTTPS connection (4): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (5): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
Incremented Retry for (url='/simple/pip/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
Incremented Retry for (url='/simple/wheel/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
Starting new HTTPS connection (6): pypi.org:443
Incremented Retry for (url='/simple/wheel/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
Starting new HTTPS connection (7): pypi.org:443
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (8): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
Incremented Retry for (url='/simple/pip/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
Starting new HTTPS connection (9): pypi.org:443
Incremented Retry for (url='/simple/wheel/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
Starting new HTTPS connection (10): pypi.org:443
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (11): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
Incremented Retry for (url='/simple/pip/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
Starting new HTTPS connection (12): pypi.org:443
Incremented Retry for (url='/simple/wheel/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
Starting new HTTPS connection (13): pypi.org:443
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (14): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
Incremented Retry for (url='/simple/pip/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
Starting new HTTPS connection (15): pypi.org:443
Incremented Retry for (url='/simple/wheel/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/setuptools/
Starting new HTTPS connection (16): pypi.org:443
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (17): pypi.org:443
Could not fetch URL https://pypi.org/simple/setuptools/: connection error: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/setuptools/ (Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))) - skipping
Could not fetch URL https://pypi.org/simple/pip/: connection error: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))) - skipping
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/wheel/
Starting new HTTPS connection (18): pypi.org:443
Could not fetch URL https://pypi.org/simple/wheel/: connection error: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/wheel/ (Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))) - skipping

(pipbug) C:\MISC\pipbug>python -m pip install -v -U "pip<20.3"
Using pip 20.3 from C:\MISC\pipbug\pipbug\lib\site-packages\pip (python 3.9)
Non-user install because user site-packages disabled
Created temporary directory: C:\Users\jap16664\AppData\Local\Temp\pip-ephem-wheel-cache-kx140v46
Created temporary directory: C:\Users\jap16664\AppData\Local\Temp\pip-req-tracker-_qzqnpln
Initialized build tracking at C:\Users\jap16664\AppData\Local\Temp\pip-req-tracker-_qzqnpln
Created build tracker: C:\Users\jap16664\AppData\Local\Temp\pip-req-tracker-_qzqnpln
Entered build tracker: C:\Users\jap16664\AppData\Local\Temp\pip-req-tracker-_qzqnpln
Created temporary directory: C:\Users\jap16664\AppData\Local\Temp\pip-install-mzbwctla
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/pip/
Getting page https://pypi.org/simple/pip/
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/pip/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (2): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (3): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (4): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (5): pypi.org:443
Incremented Retry for (url='/simple/pip/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /simple/pip/
Starting new HTTPS connection (6): pypi.org:443
Could not fetch URL https://pypi.org/simple/pip/: connection error: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))) - skipping
Given no hashes to check 0 links for project 'pip': discarding no candidates
ERROR: Could not find a version that satisfies the requirement pip<20.3
ERROR: No matching distribution found for pip<20.3
Exception information:
Traceback (most recent call last):
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 171, in _merge_into_criterion
    crit = self.state.criteria[name]
KeyError: 'pip'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 310, in resolve
    name, crit = self._merge_into_criterion(r, parent=None)
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 173, in _merge_into_criterion
    crit = Criterion.from_requirement(self._p, requirement, parent)
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 83, in from_requirement
    raise RequirementsConflicted(criterion)
pip._vendor.resolvelib.resolvers.RequirementsConflicted: Requirements conflict: SpecifierRequirement('pip<20.3')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 121, in resolve
    self._result = resolver.resolve(
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 445, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 312, in resolve
    raise ResolutionImpossible(e.criterion.information)
pip._vendor.resolvelib.resolvers.ResolutionImpossible: [RequirementInformation(requirement=SpecifierRequirement('pip<20.3'), parent=None)]

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_internal\cli\base_command.py", line 210, in _main
    status = self.run(options, args)
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_internal\cli\req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
    requirement_set = resolver.resolve(
  File "C:\MISC\pipbug\pipbug\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve
    six.raise_from(error, e)
  File "<string>", line 3, in raise_from
pip._internal.exceptions.DistributionNotFound: No matching distribution found for pip<20.3
Removed build tracker: 'C:\\Users\\jap16664\\AppData\\Local\\Temp\\pip-req-tracker-_qzqnpln'

(pipbug) C:\MISC\pipbug>

japagetw on Dec 1, 2020

The fix suggested by @tomerv solved my problem. The two lines are in question are lines 961 and 962 of connectionpool.py. You should apply this fix to all instances of connectionpool.py that contain these two lines. One instance will be in the pip package and another instance will be in urllib3 package if you have it installed.

japagetw on Dec 10, 2020