test_urllib fail in s390x buildbots: http://www.example.com/

[pablogsal]

BPO	36019
Nosy	@vstinner, @matrixise, @pablogsal, @miss-islington, @sobolevn
PRs	bpo-36019: Use pythontest.net instead of example.com #11941 [3.7] bpo-36019: Use pythontest.net instead of example.com in network tests (GH-11941) #11989 [2.7] bpo-36019: Use pythontest.net instead of example.com in network tests (GH-11941) #12177

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-03-05.14:20:57.161>
created_at = <Date 2019-02-18.00:41:35.062>
labels = ['3.8', '3.7', 'tests']
title = 'test_urllib fail in s390x buildbots: http://www.example.com/'
updated_at = <Date 2022-02-05.11:45:50.977>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2022-02-05.11:45:50.977>
actor = 'sobolevn'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-05.14:20:57.161>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2019-02-18.00:41:35.062>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 36019
keywords = ['patch']
message_count = 22.0
messages = ['335793', '335812', '335815', '335816', '335828', '335958', '335963', '335969', '335991', '336249', '336308', '336309', '336313', '337153', '337158', '337168', '337176', '337177', '337187', '337188', '412566', '412568']
nosy_count = 6.0
nosy_names = ['vstinner', 'matrixise', 'David.Edelsohn', 'pablogsal', 'miss-islington', 'sobolevn']
pr_nums = ['11941', '11989', '12177']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36019'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[pablogsal]

test_urllib fail in s390x buildbots. It does not seem like a temporary failure as they keep failing consistently. Some failed builds:

https://buildbot.python.org/all/#builders/126/builds/1010
https://buildbot.python.org/all/#builders/122/builds/1026
https://buildbot.python.org/all/#builders/119/builds/1060
https://buildbot.python.org/all/#builders/21/builds/2332

======================================================================
ERROR: test_close (test.test_urllib2net.CloseSocketTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 89, in test_close
    response = _urlopen_with_retry(url)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

======================================================================
ERROR: test_custom_headers (test.test_urllib2net.OtherNetworkTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 181, in test_custom_headers
    opener.open(request)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

======================================================================
ERROR: test_http_basic (test.test_urllib2net.TimeoutTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 264, in test_http_basic
    u = _urlopen_with_retry(url)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

======================================================================
ERROR: test_http_default_timeout (test.test_urllib2net.TimeoutTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 274, in test_http_default_timeout
    u = _urlopen_with_retry(url)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

======================================================================
ERROR: test_http_no_timeout (test.test_urllib2net.TimeoutTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 286, in test_http_no_timeout
    u = _urlopen_with_retry(url, timeout=None)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden
/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/support/__init__.py:1539: ResourceWarning: unclosed <socket.socket [closed] fd=3, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>
  gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/support/__init__.py:1539: ResourceWarning: unclosed <socket.socket [closed] fd=4, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>
  gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/support/__init__.py:1539: ResourceWarning: unclosed <socket.socket [closed] fd=5, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>
  gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/support/__init__.py:1539: ResourceWarning: unclosed <socket.socket [closed] fd=6, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6>
  gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
test test_urllib2net failed

======================================================================
ERROR: test_http_timeout (test.test_urllib2net.TimeoutTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 295, in test_http_timeout
    u = _urlopen_with_retry(url, timeout=120)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/dje/cpython-buildarea/3.7.edelsohn-rhel-z/build/Lib/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

---

Ran 15 tests in 1.006s
FAILED (errors=6, skipped=1)
3 tests failed again:
test_urllib2 test_urllib2net test_urllibnet

[vstinner]

These random network failure occur with http://www.example.com/:
#10608 (comment)

I don't think that it's a good idea to use a public server for our tests. I would be better to use pythontest.net instead.

[matrixise]

Use a public server or pythontest.net server (it's a public server on the Internet). could we the http requests? I use this practice for the unit test with an external web service, but for the integration tests, I prefer to use the real web service.

[matrixise]

sorry, error with my copy/paste/fixing_words: but my sentence was "could we mock the http requests?"

[vstinner]

could we mock the http requests?

No, the tests are functional tests which use deliberate HTTP request to public servers.

I suggest to use a server that we control rather multiple "third-party" servers. I'm trying to keep a list of external services used by Python test suite:
https://pythondev.readthedocs.io/infra.html#services-used-by-unit-tests

[matrixise]

ok for me if you prefer to use a function test with pythontest.net

[matrixise]

Here is the list of the external resources that we use in the tests.

test_issue16464 (test.test_urllib2.MiscTests) ... skipped "Resource 'http://www.example.com/' is not available"
test_close (test.test_urllib2net.CloseSocketTest) ... skipped "Resource 'http://www.example.com/' is not available"
test_custom_headers (test.test_urllib2net.OtherNetworkTests) ... skipped "Resource 'http://www.example.com' is not available"
test_sites_no_connection_close (test.test_urllib2net.OtherNetworkTests) ... skipped 'XXX: http://www.imdb.com is gone'
test_http_basic (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'http://www.example.com' is not available"
test_http_default_timeout (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'http://www.example.com' is not available"
test_http_no_timeout (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'http://www.example.com' is not available"
test_http_timeout (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'http://www.example.com' is not available"

in the failed tests:
test_urllib2 test_urllib2net test_urllibnet

[matrixise]

@vstinner and @pablogsal

I started to work on this issue, the PR is in WIP mode.

[matrixise]

@vstinner I have fixed some URLs but we need to update pythontest.net for some tests.

For example: test.test_urllib2.MiscTests.test_issue16464 raises a HTTP 405 and pythontest.net does not support the requested method.

test_networked_trusted_by_default_cert (test.test_httplib.HTTPSTest) ... skipped "Resource 'www.python.org' is not available"
test_logincapa (test.test_imaplib.RemoteIMAPTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
test_logout (test.test_imaplib.RemoteIMAPTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
test_logincapa (test.test_imaplib.RemoteIMAP_SSLTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
test_logout (test.test_imaplib.RemoteIMAP_SSLTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
test_logincapa (test.test_imaplib.RemoteIMAP_STARTTLSTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
test_logout (test.test_imaplib.RemoteIMAP_STARTTLSTest) ... skipped "Resource 'cyrus.andrew.cmu.edu' is not available"
skipped "Resource 'news.trigofacile.com' is not available"
skipped "Resource 'nntp.aioe.org' is not available"
test_connect (test.test_smtpnet.SmtpSSLTest) ... skipped "Resource 'smtp.gmail.com' is not available"
test_connect_default_port (test.test_smtpnet.SmtpSSLTest) ... skipped "Resource 'smtp.gmail.com' is not available"
test_connect_using_sslcontext (test.test_smtpnet.SmtpSSLTest) ... skipped "Resource 'smtp.gmail.com' is not available"
test_connect_using_sslcontext_verified (test.test_smtpnet.SmtpSSLTest) ... skipped "Resource 'smtp.gmail.com' is not available"
test_connect_starttls (test.test_smtpnet.SmtpTest) ... skipped "Resource 'smtp.gmail.com' is not available"
test_get_server_certificate_ipv6 (test.test_ssl.NetworkedTests) ... skipped "Resource 'ipv6.google.com' is not available"
test_idna (test.test_socket.GeneralModuleTests) ... skipped "Resource 'python.org' is not available"
testAcceptTimeout (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
testConnectTimeout (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
testRecvTimeout (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
testSend (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
testSendall (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
testSendto (test.test_timeout.TCPTimeoutTestCase) ... skipped "Resource 'www.python.org.' is not available"
test_issue16464 (test.test_urllib2.MiscTests) ... skipped "Resource 'http://www.example.com/' is not available"

[pablogsal]

Related failure:

https://buildbot.python.org/all/#/builders/141/builds/1233

----------------------------------------------------------------------
Ran 56 tests in 25.105s
OK (skipped=1)
Re-running test 'test_normalization' in verbose mode
test_bug_834676 (test.test_normalization.NormalizationTest) ... ok
test test_normalization failed
test_main (test.test_normalization.NormalizationTest) ... fetching http://www.pythontest.net/unicode/11.0.0/NormalizationTest.txt ...
FAIL
======================================================================
FAIL: test_main (test.test_normalization.NormalizationTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/urllib/request.py", line 1316, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
socket.gaierror: [Errno -3] Temporary failure in name resolution
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_normalization.py", line 41, in test_main
    testdata = open_urlresource(TESTDATAURL, encoding="utf-8",
urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name resolution>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_normalization.py", line 47, in test_main
    self.fail(f"Could not retrieve {TESTDATAURL}")
AssertionError: Could not retrieve http://www.pythontest.net/unicode/11.0.0/NormalizationTest.txt

---

Ran 2 tests in 20.044s
FAILED (failures=1)
Re-running test 'test_urllib2net' in verbose mode
test_close (test.test_urllib2net.CloseSocketTest) ... skipped "Resource 'http://www.example.com/' is not available"
test_custom_headers (test.test_urllib2net.OtherNetworkTests) ... skipped "Resource 'http://www.example.com' is not available"
test_file (test.test_urllib2net.OtherNetworkTests) ... ok
test_ftp (test.test_urllib2net.OtherNetworkTests) ... ok
test_redirect_url_withfrag (test.test_urllib2net.OtherNetworkTests) ... skipped "Resource 'http://www.pythontest.net/redir/with_frag/' is not available"
test_sites_no_connection_close (test.test_urllib2net.OtherNetworkTests) ... skipped 'XXX: http://www.imdb.com is gone'
test_urlwithfrag (test.test_urllib2net.OtherNetworkTests) ... skipped "Resource 'http://www.pythontest.net/index.html#frag' is not available"
test_ftp_basic (test.test_urllib2net.TimeoutTest) ... ok
test_ftp_default_timeout (test.test_urllib2net.TimeoutTest) ... ok
test_ftp_no_timeout (test.test_urllib2net.TimeoutTest) ... ok
test_ftp_timeout (test.test_urllib2net.TimeoutTest) ... ok
test_http_basic (test.test_urllib2net.TimeoutTest) ... ok
test_http_default_timeout (test.test_urllib2net.TimeoutTest) ... ok
test_http_no_timeout (test.test_urllib2net.TimeoutTest) ... ok
/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/support/init.py:1608: ResourceWarning: unclosed <socket.socket fd=3, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('45.56.109.169', 46650), raddr=('104.236.16.9', 21)>
gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/support/init.py:1608: ResourceWarning: unclosed <socket.socket fd=4, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('45.56.109.169', 46662), raddr=('104.236.16.9', 21)>
gc.collect()
ResourceWarning: Enable tracemalloc to get the object allocation traceback
test_http_timeout (test.test_urllib2net.TimeoutTest) ... ok
----------------------------------------------------------------------
Ran 15 tests in 686.335s
OK (skipped=5)
1 test failed again:
test_normalization

Also, it seems that there are some socket leaks.

[vstinner]

New changeset a40681d by Victor Stinner (Stéphane Wirtel) in branch 'master':
bpo-36019: Use pythontest.net instead of example.com in network tests (GH-11941)
a40681d