The HTTPSMultiRepositoryPublicKeyRetriever does use other server when it gets a ConnectionError

[csatl]

I have HTTPSMultiRepositoryPublicKeyRetriever setup to use two respositories. However it only attempts the other on 500 errors, but not any thing similar like ConnectionErrors.

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 603, in urlopen
    chunked=chunked)
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 387, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 383, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/local/lib/python3.7/http/client.py", line 1336, in getresponse
    response.begin()
  File "/usr/local/lib/python3.7/http/client.py", line 306, in begin
    version, status, reason = self._read_status()
  File "/usr/local/lib/python3.7/http/client.py", line 267, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/local/lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "/usr/local/lib/python3.7/ssl.py", line 1071, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/local/lib/python3.7/ssl.py", line 929, in read
    return self._sslobj.read(len, buffer)
ConnectionResetError: [Errno 104] Connection reset by peer
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 641, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/local/lib/python3.7/site-packages/urllib3/util/retry.py", line 368, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/usr/local/lib/python3.7/site-packages/urllib3/packages/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 603, in urlopen
    chunked=chunked)
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 387, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 383, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/local/lib/python3.7/http/client.py", line 1336, in getresponse
    response.begin()
  File "/usr/local/lib/python3.7/http/client.py", line 306, in begin
    version, status, reason = self._read_status()
  File "/usr/local/lib/python3.7/http/client.py", line 267, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/local/lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "/usr/local/lib/python3.7/ssl.py", line 1071, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/local/lib/python3.7/ssl.py", line 929, in read
    return self._sslobj.read(len, buffer)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/key.py", line 101, in retrieve
    return self._retrieve(url, requests_kwargs)
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/key.py", line 111, in _retrieve
    **requests_kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 546, in get
    return self.request('GET', url, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/cachecontrol/adapter.py", line 53, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 498, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/src/app/libauth_asap/token.py", line 97, in verify_token
    leeway=180  # Do not fail due to small time sync issues. (seconds)
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/verifier.py", line 32, in verify_jwt
    public_key = self._retrieve_pub_key(key_identifier, requests_kwargs)
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/verifier.py", line 40, in _retrieve_pub_key
    key_identifier, **requests_kwargs)
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/key.py", line 142, in retrieve
    return retriever.retrieve(key_identifier, **requests_kwargs)
  File "/usr/local/lib/python3.7/site-packages/atlassian_jwt_auth/key.py", line 107, in retrieve
    raise PublicKeyRetrieverException(e, status_code=status_code)
atlassian_jwt_auth.exceptions.PublicKeyRetrieverException: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))