I think this is the reason we get errors like this instead of a proper exception:

```
EEE
======================================================================
ERROR: test_serving (werkzeug.testsuite.serving.ServingTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 43, in new_func
    return f(*args, **kwargs)
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 79, in test_serving
    rv = urlopen('http://%s/?foo=bar&baz=blah' % addr).read()
  File "/usr/lib64/python3.3/urllib/request.py", line 160, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python3.3/urllib/request.py", line 473, in open
    response = self._open(req, data)
  File "/usr/lib64/python3.3/urllib/request.py", line 491, in _open
    '_open', req)
  File "/usr/lib64/python3.3/urllib/request.py", line 451, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.3/urllib/request.py", line 1272, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "/usr/lib64/python3.3/urllib/request.py", line 1257, in do_open
    r = h.getresponse()
  File "/usr/lib64/python3.3/http/client.py", line 1143, in getresponse
    response.begin()
  File "/usr/lib64/python3.3/http/client.py", line 354, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python3.3/http/client.py", line 324, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: ''

======================================================================
ERROR: test_broken_app (werkzeug.testsuite.serving.ServingTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 43, in new_func
    return f(*args, **kwargs)
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 90, in test_broken_app
    urlopen('http://%s/?foo=bar&baz=blah' % addr).read()
  File "/usr/lib64/python3.3/urllib/request.py", line 160, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python3.3/urllib/request.py", line 473, in open
    response = self._open(req, data)
  File "/usr/lib64/python3.3/urllib/request.py", line 491, in _open
    '_open', req)
  File "/usr/lib64/python3.3/urllib/request.py", line 451, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.3/urllib/request.py", line 1272, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "/usr/lib64/python3.3/urllib/request.py", line 1257, in do_open
    r = h.getresponse()
  File "/usr/lib64/python3.3/http/client.py", line 1143, in getresponse
    response.begin()
  File "/usr/lib64/python3.3/http/client.py", line 354, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python3.3/http/client.py", line 324, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: ''

======================================================================
ERROR: test_absolute_requests (werkzeug.testsuite.serving.ServingTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 43, in new_func
    return f(*args, **kwargs)
  File "/home/untitaker/projects/werkzeug/werkzeug/testsuite/serving.py", line 110, in test_absolute_requests
    res = conn.getresponse()
  File "/usr/lib64/python3.3/http/client.py", line 1143, in getresponse
    response.begin()
  File "/usr/lib64/python3.3/http/client.py", line 354, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python3.3/http/client.py", line 324, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: ''

----------------------------------------------------------------------
Ran 3 tests in 0.769s

FAILED (errors=3)
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 34239)
----------------------------------------
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 46070)
----------------------------------------
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 46779)
----------------------------------------
```