ValueError: check_hostname requires server_hostname
Question:
I was going to install pandas and epanettools on my computer using the code shown below with python 3.8.5 and I received one Error exception.
Code:
pip install epanettools
pip install pandas
Actually, I could install epanettools on my old computer and I bought a new computer and I wanted to do the same thing on my new computer, but it didn’t work and the error exception shown below after running the code shown above:
Error: Exception:
ERROR: Exception:
Traceback (most recent call last):
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclibase_command.py", line 180, in _main
status = self.run(options, args)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclireq_command.py", line 204, in wrapper
return func(self, options, args)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalcommandsinstall.py", line 318, in run
requirement_set = resolver.resolve(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibresolver.py", line 127, in resolve
result = self._result = resolver.resolve(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 473, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 341, in resolve
name, crit = self._merge_into_criterion(r, parent=None)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 172, in _merge_into_criterion
if not criterion.candidates:
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibstructs.py", line 139, in __bool__
return bool(self._sequence)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 143, in __bool__
return any(self)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 129, in <genexpr>
return (c for c in iterator if id(c) not in self._incompatible_ids)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 30, in _iter_built
for version, func in infos:
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfactory.py", line 258, in iter_index_candidate_infos
result = self._finder.find_best_candidate(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 879, in find_best_candidate
candidates = self.find_all_candidates(project_name)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 824, in find_all_candidates
page_candidates = list(page_candidates_it)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexsources.py", line 134, in page_candidates
yield from self._candidates_from_page(self._link)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 783, in process_project_url
html_page = self._link_collector.fetch_page(project_url)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 512, in fetch_page
return _get_html_page(location, session=self.session)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 422, in _get_html_page
resp = _get_html_response(url, session=session)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 120, in _get_html_response
resp = session.get(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 555, in get
return self.request('GET', url, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalnetworksession.py", line 449, in request
return super().request(method, url, *args, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorcachecontroladapter.py", line 53, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestsadapters.py", line 439, in send
resp = conn.urlopen(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 696, in urlopen
self._prepare_proxy(conn)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 964, in _prepare_proxy
conn.connect()
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 359, in connect
conn = self._connect_tls_proxy(hostname, conn)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 500, in _connect_tls_proxy
return ssl_wrap_socket(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 432, in ssl_wrap_socket
ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 474, in _ssl_wrap_socket_impl
return ssl_context.wrap_socket(sock)
File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 500, in wrap_socket
return self.sslsocket_class._create(
File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 997, in _create
raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
Could you please tell me how to resolve this error? Appreicate a lot if any advices!
Answers:
Are you using proxy software, like V2ray, SSR…?
If so, close the software, and try again.
On Linux, the problem can be resolved by replacing https with http in the proxy settings environment variable export https_proxy=http://123.123.123.123:8888. Note, it is proxy settings for https, but an http address is used.
I fixed the problem.
Go to –> windows setting –> Network& Internet –> Proxy –> Switch Turn on (Use a Proxy server) to Turn Off
So far no one has suggested that the pip version is one of the culprits as well.
If your virtual environment is having a recent version of pip (e.g. 21.3.1), try to download the older version same as the one installed in the main python directory (e.g. pip version 19.0.3).
For Windows, copy it to the venvLibsite-packages folder and unzip the contents, then cd into that folder then enter the commands python setup.py install to downgrade the pip version.
SSL Trust Issues:
pip install numpy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
On windows,the problem can be resolved by add ‘pypi.org’ to the proxy whitelist in the proxy settings
maybe you can try to replace ip to proxy server hostname if commands run in unix and you know server hostname
Had the same problem. Make sure you’re not using a proxy server. Check ‘Settings – Network & internet – Proxy’ and turn off "use a proxy server".
I was going to install pandas and epanettools on my computer using the code shown below with python 3.8.5 and I received one Error exception.
Code:
pip install epanettools
pip install pandas
Actually, I could install epanettools on my old computer and I bought a new computer and I wanted to do the same thing on my new computer, but it didn’t work and the error exception shown below after running the code shown above:
Error: Exception:
ERROR: Exception:
Traceback (most recent call last):
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclibase_command.py", line 180, in _main
status = self.run(options, args)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclireq_command.py", line 204, in wrapper
return func(self, options, args)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalcommandsinstall.py", line 318, in run
requirement_set = resolver.resolve(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibresolver.py", line 127, in resolve
result = self._result = resolver.resolve(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 473, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 341, in resolve
name, crit = self._merge_into_criterion(r, parent=None)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 172, in _merge_into_criterion
if not criterion.candidates:
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibstructs.py", line 139, in __bool__
return bool(self._sequence)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 143, in __bool__
return any(self)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 129, in <genexpr>
return (c for c in iterator if id(c) not in self._incompatible_ids)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 30, in _iter_built
for version, func in infos:
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfactory.py", line 258, in iter_index_candidate_infos
result = self._finder.find_best_candidate(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 879, in find_best_candidate
candidates = self.find_all_candidates(project_name)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 824, in find_all_candidates
page_candidates = list(page_candidates_it)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexsources.py", line 134, in page_candidates
yield from self._candidates_from_page(self._link)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 783, in process_project_url
html_page = self._link_collector.fetch_page(project_url)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 512, in fetch_page
return _get_html_page(location, session=self.session)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 422, in _get_html_page
resp = _get_html_response(url, session=session)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 120, in _get_html_response
resp = session.get(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 555, in get
return self.request('GET', url, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalnetworksession.py", line 449, in request
return super().request(method, url, *args, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorcachecontroladapter.py", line 53, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestsadapters.py", line 439, in send
resp = conn.urlopen(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 696, in urlopen
self._prepare_proxy(conn)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 964, in _prepare_proxy
conn.connect()
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 359, in connect
conn = self._connect_tls_proxy(hostname, conn)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 500, in _connect_tls_proxy
return ssl_wrap_socket(
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 432, in ssl_wrap_socket
ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 474, in _ssl_wrap_socket_impl
return ssl_context.wrap_socket(sock)
File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 500, in wrap_socket
return self.sslsocket_class._create(
File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 997, in _create
raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
Could you please tell me how to resolve this error? Appreicate a lot if any advices!
Are you using proxy software, like V2ray, SSR…?
If so, close the software, and try again.
On Linux, the problem can be resolved by replacing https with http in the proxy settings environment variable export https_proxy=http://123.123.123.123:8888. Note, it is proxy settings for https, but an http address is used.
I fixed the problem.
Go to –> windows setting –> Network& Internet –> Proxy –> Switch Turn on (Use a Proxy server) to Turn Off
So far no one has suggested that the pip version is one of the culprits as well.
If your virtual environment is having a recent version of pip (e.g. 21.3.1), try to download the older version same as the one installed in the main python directory (e.g. pip version 19.0.3).
For Windows, copy it to the venvLibsite-packages folder and unzip the contents, then cd into that folder then enter the commands python setup.py install to downgrade the pip version.
SSL Trust Issues:
pip install numpy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
On windows,the problem can be resolved by add ‘pypi.org’ to the proxy whitelist in the proxy settings
maybe you can try to replace ip to proxy server hostname if commands run in unix and you know server hostname
Had the same problem. Make sure you’re not using a proxy server. Check ‘Settings – Network & internet – Proxy’ and turn off "use a proxy server".