^^&&^^

Edit File: _cmd.py

import logging

from pip._vendor import requests

from pip._vendor.cachecontrol.adapter import CacheControlAdapter
from pip._vendor.cachecontrol.cache import DictCache
from pip._vendor.cachecontrol.controller import logger

from argparse import ArgumentParser

def setup_logging():
    logger.setLevel(logging.DEBUG)
    handler = logging.StreamHandler()
    logger.addHandler(handler)

def get_session():
    adapter = CacheControlAdapter(
        DictCache(),
        cache_etags=True,
        serializer=None,
        heuristic=None,
    )
    sess = requests.Session()
    sess.mount('http://', adapter)
    sess.mount('https://', adapter)

sess.cache_controller = adapter.controller
    return sess

def get_args():
    parser = ArgumentParser()
    parser.add_argument('url', help='The URL to try and cache')
    return parser.parse_args()

def main(args=None):
    args = get_args()
    sess = get_session()

# Make a request to get a response
    resp = sess.get(args.url)

# Turn on logging
    setup_logging()

# try setting the cache
    sess.cache_controller.cache_response(resp.request, resp.raw)

# Now try to get it
    if sess.cache_controller.cached_request(resp.request):
        print('Cached!')
    else:
        print('Not cached :(')

if __name__ == '__main__':
    main()