[Python] urllib3 LocationParseError when installing packages with pip in remote Centos over SSH

When I execute this command on a remote Centos7 host in Putty/over SSH:

pip install -r requirements.txt

I got this error

urllib3.exceptions.LocationParseError: Failed to parse: your-proxy-urlort


within following output.

Error Output


pip install -r requirements.txt
Collecting flask (from -r requirements.txt (line 1))
Exception:
Traceback (most recent call last):
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/commands/install.py", line 346, in run
requirement_set.prepare_files(finder)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/req/req_set.py", line 381, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/req/req_set.py", line 557, in _prepare_file
require_hashes
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/req/req_install.py", line 278, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/index.py", line 465, in find_requirement
all_candidates = self.find_all_candidates(req.name)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/index.py", line 423, in find_all_candidates
for page in self._get_pages(url_locations, project_name):
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/index.py", line 568, in _get_pages
page = self._get_page(location)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/index.py", line 683, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/index.py", line 792, in get_page
"Cache-Control": "max-age=600",
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 543, in get
return self.request('GET', url, **kwargs)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/download.py", line 386, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 530, in request
resp = self.send(prep, **send_kwargs)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/sessions.py", line 640, in send
r = adapter.send(request, **kwargs)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/cachecontrol/adapter.py", line 47, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/adapters.py", line 405, in send
conn = self.get_connection(request.url, proxies)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/adapters.py", line 303, in get_connection
proxy_manager = self.proxy_manager_for(proxy)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/requests/adapters.py", line 197, in proxy_manager_for
**proxy_kwargs)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/urllib3/poolmanager.py", line 449, in proxy_from_url
return ProxyManager(proxy_url=url, **kw)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/urllib3/poolmanager.py", line 394, in __init__
proxy = parse_url(proxy_url)
File "/var/www/centre_appel_ia/venv/lib64/python3.6/site-packages/pip/_vendor/urllib3/util/url.py", line 206, in parse_url
raise LocationParseError(url)
pip._vendor.urllib3.exceptions.LocationParseError: Failed to parse: your-proxy-urlort


How can I solve this problem?

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