Pip, proxy authentication, and "Unsupported proxy scheme"

Question

Trying to install pip on a new python installation. I am stuck with proxy errors. Looks like an error in get-pip or urllib3 ??

Question: Do I need to go through the pain of setting up CNTLM as described here , or is there a shortcut?

the get-pip.py documentation says that use the option --proxy="[user: passwd@ ]proxy.server:port" to specify the proxy server and the corresponding authentication. But it seems like switching to everything, as in the case of urllib3 , which interprets "myusr" as a URL scheme, due to ":" I assume (?).

 C:\ProgFiles\Python27>get-pip.py --proxy myusr: mypswd@111.222.333.444 :80 Downloading/unpacking pip Cleaning up... Exception: Traceback (most recent call last): File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\basecommand.py", line 122, in main status = self.run(options, args) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\commands\install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\req.py", line 1177, in prepare_files url = finder.find_requirement(req_to_install, upgrade=self.upgrade) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\index.py", line 194, in find_requirement page = self._get_page(main_index_url, req) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\index.py", line 568, in _get_page session=self.session, File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\index.py", line 670, in get_page resp = session.get(url, headers={"Accept": "text/html"}) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\sessions.py", line 468, in get return self.request('GET', url, **kwargs) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\download.py", line 237, in request return super(PipSession, self).request(method, url, *args, **kwargs) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\sessions.py", line 456, in request resp = self.send(prep, **send_kwargs) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\sessions.py", line 559, in send r = adapter.send(request, **kwargs) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\adapters.py", line 305, in send conn = self.get_connection(request.url, proxies) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\adapters.py", line 215, in get_connection block=self._pool_block) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\packages\urllib3\poolmanager.py", line 258, in proxy_fro m_url return ProxyManager(proxy_url=url, **kw) File "c:\users\sg0219~1\appdata\local\temp\tmpxwg_en\pip.zip\pip\_vendor\requests\packages\urllib3\poolmanager.py", line 214, in __init__ 'Not supported proxy scheme %s' % self.proxy.scheme AssertionError: Not supported proxy scheme myusr Storing debug log for failure in C:\Users\myusr\pip\pip.log C:\ProgFiles\Python27> 

When I run the command without usr and password, it works fine, but the proxy rejects the request requiring authentication ("407 authenticationrequired").

 C:\ProgFiles\Python27>get-pip.py --proxy 111.222.333.444:80 Downloading/unpacking pip Cannot fetch index base URL https://pypi.python.org/simple/ Could not find any downloads that satisfy the requirement pip Cleaning up... No distributions at all found for pip Storing debug log for failure in C:\Users\sg0219898\pip\pip.log C:\ProgFiles\Python27>cat C:\Users\sg0219898\pip\pip.log ------------------------------------------------------------ C:\ProgFiles\Python27\get-pip.py run on 09/29/14 16:23:26 Downloading/unpacking pip Getting page https://pypi.python.org/simple/pip/ Could not fetch URL https://pypi.python.org/simple/pip/: connection error: ('Cannot connect to proxy.', error('Tunnel connection failed: 407 authenticationrequired',)) Will skip URL https://pypi.python.org/simple/pip/ when looking for download links for pip Getting page https://pypi.python.org/simple/ Could not fetch URL https://pypi.python.org/simple/: connection error: ('Cannot connect to proxy.', error('Tunnel connection failed: 407 authenticationrequired',)) Will skip URL https://pypi.python.org/simple/ when looking for download links for pip Cannot fetch index base URL https://pypi.python.org/simple/ URLs to search for versions for pip: * https://pypi.python.org/simple/pip/ Getting page https://pypi.python.org/simple/pip/ Could not fetch URL https://pypi.python.org/simple/pip/: connection error: ('Cannot connect to proxy.', error('Tunnel connection failed: 407 authenticationrequired',)) Will skip URL https://pypi.python.org/simple/pip/ when looking for download links for pip Could not find any downloads that satisfy the requirement pip Cleaning up... Removing temporary dir c:\users\sg0219~1\appdata\local\temp\pip_build_SG0219898... No distributions at all found for pip Exception information: Traceback (most recent call last): File "c:\users\sg0219~1\appdata\local\temp\tmp36ynxd\pip.zip\pip\basecommand.py", line 122, in main status = self.run(options, args) File "c:\users\sg0219~1\appdata\local\temp\tmp36ynxd\pip.zip\pip\commands\install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "c:\users\sg0219~1\appdata\local\temp\tmp36ynxd\pip.zip\pip\req.py", line 1177, in prepare_files url = finder.find_requirement(req_to_install, upgrade=self.upgrade) File "c:\users\sg0219~1\appdata\local\temp\tmp36ynxd\pip.zip\pip\index.py", line 277, in find_requirement raise DistributionNotFound('No distributions at all found for %s' % req) DistributionNotFound: No distributions at all found for pip C:\ProgFiles\Python27> 

I briefly reviewed urllib3\poolmanager.py and it seems to have nothing to do with username / passwords.

Answer 1

This complains about the URL scheme (which urlparse understands as myusr ) to work, what you should do:

 get-pip.py --proxy http://myusr: mypswd@111.222.333.444 :80 

Answer 2

This is because the script parameter requires http_proxy or https_proxy environment variables that contain the scheme in the URL. Set environment variables

  export http_proxy="http://<hostname>:<port>" export https_proxy="https://<hostname>:<port>" 

before running "python get-pip.py"

Answer 3

Due to the issue you were talking about, it depends on how proxy authentication was configured. For example, my intranet uses Windows AD and probably the proxy server uses Windows Integrated auth. Thus, when I do pip install --proxy http://<server-ip>:<port> <module-name> , it works fine. Note that I do not need to enter a username and password, probably due to the built-in auth.

So, you need to find out the authentication used by your proxy server. You can use the Fiddler tool (or any other network analyzer) to check the WWW-Authenticate headers in 407 response to check which auth files the server supports.