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Request Entity Too Large

See original GitHub issue

Recently started getting the follow error, without any explicit change to Raven or Sentry configuration. Google results are unrevealing. Is there something known that can cause this?

Any proper ways of logging more fully the original AttributeError, which caused the Sentry error, besides disabling Sentry?

INFO:werkzeug:172.17.42.1 - - [29/Apr/2015 01:02:51] "POST / HTTP/1.1" 500 -
ERROR:sentry.errors:Unable to reach Sentry log server: HTTP Error 413: Request Entity Too Large (url: https://app.getsentry.com/api/39671/store/, body: b'<html>\r\n<head><title>413 Request Entity Too Large</title></head>\r\n<body bgcolor="white">\r\n<center><h1>413 Request Entity Too Large</h1></center>\r\n<hr><center>nginx</center>\r\n</body>\r\n</html>\r\n')
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/site-packages/raven/transport/threaded.py", line 159, in send_sync
    super(ThreadedHTTPTransport, self).send(data, headers)
  File "/usr/local/lib/python3.4/site-packages/raven/transport/http.py", line 49, in send
    ca_certs=self.ca_certs,
  File "/usr/local/lib/python3.4/site-packages/raven/utils/http.py", line 62, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/lib/python3.4/urllib/request.py", line 461, in open
    response = meth(req, response)
  File "/usr/local/lib/python3.4/urllib/request.py", line 571, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/local/lib/python3.4/urllib/request.py", line 499, in error
    return self._call_chain(*args)
  File "/usr/local/lib/python3.4/urllib/request.py", line 433, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python3.4/urllib/request.py", line 579, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 413: Request Entity Too Large
ERROR:sentry.errors:Failed to submit message: "AttributeError: 'dict' object has no attribute 'encode'"