Test environment proxy settings

noproxy.py

#!/usr/bin/env python
from __future__ import print_function
import sys, os

# This test should show how urllib.proxy_bypass_environment()
# doesn't handle proxy environment variables correctly
# on *NIX systems.
# (It does not understand IPs or CIDR notations.)
#
# For a possible solution see the `requests` library:
# https://github.com/kennethreitz/requests/blob/b137472936cbe6a6acabab538c1d05ed4c7da638/requests/utils.py#L498-L514

# for unix environment
if sys.platform == 'darwin' or os.name == 'nt':
    print(
        "\nThis test may produce correct results on YOUR platform."
        " (I hope so.)\n"
    )

try:
    from urllib import proxy_bypass
    from urlparse import urlparse
except ImportError:
    from urllib.request import proxy_bypass
    from urllib.parse import urlparse

from requests.utils import should_bypass_proxies


os.environ['http_proxy']  = 'http://10.1.1.1:3128'
os.environ['https_proxy'] = ''
os.environ['no_proxy']    = 'localhost,127.0.0.1/8,10.1.0.0/16,.local'

get_env = lambda k: os.environ.get(k.lower()) or os.environ.get(k.upper()) or ''


test_urls = [
    'http://www.python.org:80',
    'https://www.python.org:443',
    'http://localhost/',
    'http://mydomain.local/',
    'https://10.1.1.1:443/',
    'http://10.2.2.2/',
    'http://127.0.0.1/',
]

# test
if __name__ == "__main__":
    v = '%s.%s.%s' % (sys.version_info[0], sys.version_info[1], sys.version_info[2])
    print('Python version %s' % v)
    print()

    print('HTTP_PROXY is: ' + get_env('HTTP_PROXY'))
    print('HTTPS_PROXY is: ' + get_env('HTTPS_PROXY'))
    print('NO_PROXY is: ' + get_env('NO_PROXY'))
    print()

    print('- urllib test -')
    for url in test_urls:
        netloc = urlparse(url).netloc
        proxied = 'NOT ' if proxy_bypass(netloc) else ''
        result = "URL %s request will %sbe proxied." % (url, proxied)
        print(result)
    print()

    print('- requests test -')
    for url in test_urls:
        proxied = 'NOT ' if should_bypass_proxies(url) else ''
        result = "URL %s request will %sbe proxied." % (url, proxied)
        print(result)
    print()