I have been using Sentry for a Django application that runs behind Istio Service Mesh. When I run the sample exception snippet I get the following exception:-

./manage.py shell --settings=mirussh.settings.staging
Python 3.6.5 (default, Jun 27 2018, 08:18:52) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from raven.contrib.django.raven_compat.models import client
>>> 
>>> client.captureException()

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/code.py", line 91, in runcode
    exec(code, self.locals)
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/raven/base.py", line 824, in captureException
    'raven.events.Exception', exc_info=exc_info, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/raven/contrib/django/client.py", line 303, in capture
    result = super(DjangoClient, self).capture(event_type, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/raven/base.py", line 635, in capture
    elif not self.should_capture(exc_info):
  File "/usr/local/lib/python3.6/site-packages/raven/base.py", line 828, in should_capture
    exc_name = '%s.%s' % (exc_type.__module__, exc_type.__name__)
AttributeError: 'NoneType' object has no attribute '__module__'
>>> 
2018-08-11 08:05:39,009 sentry.errors ERROR    Sentry responded with an error: <urlopen error [Errno 0] Error> (url: https://sentry.io/api/1231405/store/)
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/usr/local/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/usr/local/lib/python3.6/site-packages/raven/utils/http.py", line 39, in connect
    sock, ca_certs=ca_certs, cert_reqs=ssl.CERT_REQUIRED)
  File "/usr/local/lib/python3.6/ssl.py", line 1149, in wrap_socket
    ciphers=ciphers)
  File "/usr/local/lib/python3.6/ssl.py", line 814, in __init__
    self.do_handshake()
  File "/usr/local/lib/python3.6/ssl.py", line 1068, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/local/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
OSError: [Errno 0] Error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/raven/transport/threaded.py", line 165, in send_sync
    super(ThreadedHTTPTransport, self).send(url, data, headers)
  File "/usr/local/lib/python3.6/site-packages/raven/transport/http.py", line 43, in send
    ca_certs=self.ca_certs,
  File "/usr/local/lib/python3.6/site-packages/raven/utils/http.py", line 67, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/usr/local/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/usr/local/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python3.6/site-packages/raven/utils/http.py", line 47, in https_open
    return self.do_open(ValidHTTPSConnection, req)
  File "/usr/local/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [Errno 0] Error>
b'Sentry responded with an error: <urlopen error [Errno 0] Error> (url: https://sentry.io/api/1231405/store/)'
2018-08-11 08:05:39,011 sentry.errors.uncaught ERROR    ["AttributeError: 'NoneType' object has no attribute '__module__'", '  File "python3.6/code.py", line 91, in runcode', '  File "<console>", line 1, in <module>', '  File "raven/base.py", line 824, in captureException', '  File "raven/contrib/django/client.py", line 303, in capture', '  File "raven/base.py", line 635, in capture', '  File "raven/base.py", line 828, in should_capture']
b'["AttributeError: \'NoneType\' object has no attribute \'__module__\'", \'  File "python3.6/code.py", line 91, in runcode\', \'  File "<console>", line 1, in <module>\', \'  File "raven/base.py", line 824, in captureException\', \'  File "raven/contrib/django/client.py", line 303, in capture\', \'  File "raven/base.py", line 635, in capture\', \'  File "raven/base.py", line 828, in should_capture\']'

I modified the raven/transport/http.py to use requests instead and the exception went away:-

    def send(self, url, data, headers):
        """
        Sends a request to a remote webserver using HTTP POST.
        """
        # req = urllib2.Request(url, headers=headers)

        try:
            response = requests.post(
                url=url,
                data=data,
                timeout=self.timeout,
                verify=self.verify_ssl,
                headers=headers,
                certs=self.ca_certs,
            )
#            response = urlopen(
#                url=req,
#                data=data,
#                timeout=self.timeout,
#                verify_ssl=self.verify_ssl,
#                ca_certs=self.ca_certs,
#            )