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Automatically exported from code.google.com/p/appengine-devappserver2-experiment
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BadStatusLine and #34

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. Run the devappserver2 for a while

What is the expected output? What do you see instead?

One would expect to not see BadStatusLine errors of the sort below.

After running for a while, here's a sample of what occurs consistently, 
resulting in HTTP/500 responses for each respective failure, in a significant 
number (>50%) of requests to devappserver2:

socket.error 'unable to select on socket'
Traceback (most recent call last):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1292, in communicate
    req.parse_request()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 580, in parse_request
    success = self.read_request_line()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 611, in read_request_line
    request_line = self.rfile.readline()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 274, in readline
    data = self.rfile.readline(256)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1114, in readline
    data = self.recv(self._rbufsize)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 990, in recv
    data = self._sock.recv(size)
error: unable to select on socket
      ERROR  08 Feb 2013 21:16:22  
Traceback (most recent call last):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/runtime/wsgi.py", line 224, in Handle
    for chunk in result:
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/appstats/recording.py", line 1258, in appstats_wsgi_wrapper
    start_recording(environ)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/appstats/recording.py", line 1395, in start_recording
    time=config.LOCK_TIMEOUT, namespace=config.KEY_NAMESPACE):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/memcache/__init__.py", line 794, in add
    namespace=namespace)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/memcache/__init__.py", line 879, in _set_with_policy
    status_dict = rpc.get_result()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 604, in get_result
    return self.__get_result_hook(self)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/memcache/__init__.py", line 984, in __set_with_policy_hook
    rpc.check_success()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 570, in check_success
    self.__rpc.CheckSuccess()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
    self.request, self.response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in MakeSyncCall
    self._MakeRealSyncCall(service, call, request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 226, in _MakeRealSyncCall
    encoded_response = self._server.Send(self._path, encoded_request)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/appengine_rpc.py", line 393, in Send
    f = self.opener.open(req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 394, in open
    response = self._open(req, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 412, in _open
    '_open', req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1199, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1170, in do_open
    r = h.getresponse(buffering=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1027, in getresponse
    response.begin()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''
socket.error 'unable to select on socket'
Traceback (most recent call last):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1292, in communicate
    req.parse_request()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 580, in parse_request
    success = self.read_request_line()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 611, in read_request_line
    request_line = self.rfile.readline()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 274, in readline
    data = self.rfile.readline(256)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1114, in readline
    data = self.recv(self._rbufsize)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 990, in recv
    data = self._sock.recv(size)
error: unable to select on socket
BadStatusLine("''",)
BadStatusLine("''",)
Traceback (most recent call last):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate
    req.respond()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond
    self.server.gateway(self).respond()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond
    response = self.req.server.wsgi_app(self.env, self.start_response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/wsgi_server.py", line 227, in __call__
    return app(environ, start_response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware
    response_body = iter(application(environ, wrapped_start_response))
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/python/request_handler.py", line 87, in __call__
    self._flush_logs(response.get('logs', []))
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/python/request_handler.py", line 218, in _flush_logs
    apiproxy_stub_map.MakeSyncCall('logservice', 'Flush', request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 94, in MakeSyncCall
    return stubmap.MakeSyncCall(service, call, request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 320, in MakeSyncCall
    rpc.CheckSuccess()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
    self.request, self.response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in MakeSyncCall
    self._MakeRealSyncCall(service, call, request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 226, in _MakeRealSyncCall
    encoded_response = self._server.Send(self._path, encoded_request)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/appengine_rpc.py", line 393, in Send
    f = self.opener.open(req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 394, in open
    response = self._open(req, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 412, in _open
    '_open', req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1199, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1170, in do_open
    r = h.getresponse(buffering=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1027, in getresponse
    response.begin()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''
Traceback (most recent call last):
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate
    req.respond()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond
    self.server.gateway(self).respond()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond
    response = self.req.server.wsgi_app(self.env, self.start_response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/wsgi_server.py", line 227, in __call__
    return app(environ, start_response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware
    response_body = iter(application(environ, wrapped_start_response))
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/python/request_handler.py", line 87, in __call__
    self._flush_logs(response.get('logs', []))
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/devappserver2/python/request_handler.py", line 218, in _flush_logs
    apiproxy_stub_map.MakeSyncCall('logservice', 'Flush', request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 94, in MakeSyncCall
    return stubmap.MakeSyncCall(service, call, request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_stub_map.py", line 320, in MakeSyncCall
    rpc.CheckSuccess()
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
    self.request, self.response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in MakeSyncCall
    self._MakeRealSyncCall(service, call, request, response)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/ext/remote_api/remote_api_stub.py", line 226, in _MakeRealSyncCall
    encoded_response = self._server.Send(self._path, encoded_request)
  File "/Users/bmh/dev/vendors/appengine-devappserver2-experiment/google/appengine/tools/appengine_rpc.py", line 393, in Send
    f = self.opener.open(req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 394, in open
    response = self._open(req, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 412, in _open
    '_open', req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1199, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1170, in do_open
    r = h.getresponse(buffering=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1027, in getresponse
    response.begin()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''

Not all requests result in failure of this sort. There is no clear correlation 
between the failures and any characteristics of the request, save that static 
cached resources seem more likely to return HTTP/304. It just seems to start 
failing. Failure rate appears progressive, but this is an untested hypothesis.

What version of the product are you using? On what operating system?

VERSION
-------
release: "1.7.5"
timestamp: 1357690550
api_versions: ['1']

Mac OS X 10.8.2

Please provide any additional information below.

More information is available upon request.

Original issue reported on code.google.com by brianmh...@gmail.com on 8 Feb 2013 at 9:26

GoogleCodeExporter commented 9 years ago 
I'm noticing this on a backend which does hundreds of async urlfetch requests.

Original comment by pdknsk on 12 Feb 2013 at 12:27

GoogleCodeExporter commented 9 years ago 
I can confirm that I do a lot of urlfetch requests. Synchronously, mind you.

Original comment by brianmh...@gmail.com on 12 Feb 2013 at 1:32

GoogleCodeExporter commented 9 years ago 
This doesn't seem to be related to urlfetch (or anything really). I can notice 
this occurring sporadically on a handler that just sleeps for 100 seconds. What 
seems safe to say is that the error is more likely to occur with increasing 
request time.

Original comment by pdknsk on 21 Feb 2013 at 7:18

GoogleCodeExporter commented 9 years ago 
Could you retest this with the 0.7 release?

Original comment by bquin...@google.com on 25 Feb 2013 at 5:20

GoogleCodeExporter commented 9 years ago 
I just tried, it's the same. The same code on frontends works fine.

Original comment by pdknsk on 25 Feb 2013 at 10:54

GoogleCodeExporter commented 9 years ago 
This issue no longer seems to occurs for me. 

That being said, I have also changed to Python 2.7.3 via homebrew, from the 
native version of Python on the Mac. Homebrew's python could have fixed the 
underlying problem for me.

I will be certain to report if I encounter the issue again (here, or if this 
issue is closed I will reference this).

Original comment by brianmh...@gmail.com on 25 Feb 2013 at 8:18

GoogleCodeExporter commented 9 years ago 
I cannot reproduce this in 0.8 so it's probably fixed.

Original comment by pdknsk on 12 Mar 2013 at 6:57

GoogleCodeExporter commented 9 years ago 
Literally seconds after I wrote this, it occurred again, after working for 
quite a while before.

Original comment by pdknsk on 12 Mar 2013 at 6:59

GoogleCodeExporter commented 9 years ago 
I'm getting a somewhat different stack trace, so maybe it's not for the same 
reason.

BadStatusLine("''",)
Traceback (most recent call last):
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate
    req.respond()
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond
    self.server.gateway(self).respond()
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond
    response = self.req.server.wsgi_app(self.env, self.start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/wsgi_server.py", line 245, in __call__
    return app(environ, start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 2091, in __call__
    return self._handle_request(environ, start_response, inst)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 601, in _handle_request
    environ, wrapped_start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware
    response_body = iter(application(environ, wrapped_start_response))
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 1934, in _handle_script_request
    request_id, request_type)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/instance.py", line 382, in handle
    request_type))
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/http_runtime.py", line 147, in handle
    response = connection.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1034, in getresponse
    response.begin()
  File "/usr/lib/python2.7/httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.7/httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''

Original comment by pdknsk on 12 Mar 2013 at 7:01

GoogleCodeExporter commented 9 years ago 
Could you try again with --dev_appserver_log_level=debug and send me the output?

Original comment by bquin...@google.com on 13 Mar 2013 at 11:05

GoogleCodeExporter commented 9 years ago 
This is the full request log of a handler on '/' that just sleeps for 100 
seconds.

DEBUG    2013-03-14 15:26:53,706 appengine_rpc.py:174] Server: 
appengine.google.com
INFO     2013-03-14 15:26:53,721 sdk_update_checker.py:244] Checking for 
updates to the SDK.
DEBUG    2013-03-14 15:26:53,723 appengine_rpc.py:392] Sending HTTPS request:
POST 
/api/updatecheck?api_versions=%5B%271%27%5D&release=1.7.6&runtime=python27×tamp
=1360882848 HTTPS/1.1
Host: appengine.google.com
X-appcfg-api-version: 1
Content-type: application/octet-stream
User-agent: devappserver2_py/1.7.6 Linux/3.5.0-25-generic Python/2.7.3.final.0

INFO     2013-03-14 15:26:53,991 sdk_update_checker.py:288] This SDK release is 
newer than the advertised release.
INFO     2013-03-14 15:26:54,037 api_server.py:152] Starting API server at: 
http://localhost:57727
DEBUG    2013-03-14 15:26:54,062 inotify_file_watcher.py:97] 
_add_watch_for_path('/home/user/appengine/k/be')
INFO     2013-03-14 15:26:54,064 dispatcher.py:150] Starting server "be" 
running at: http://localhost:8080
INFO     2013-03-14 15:26:54,066 admin_server.py:117] Starting admin server at: 
http://localhost:8000
DEBUG    2013-03-14 15:26:56,633 instance.py:278] Started instance: <Instance 
0: 0/8, total: 0 [handling ready request]>
DEBUG    2013-03-14 15:26:56,634 server.py:1972] Started instance: <Instance 0: 
0/8, total: 0 [handling ready request]> at http://localhost:52972
DEBUG    2013-03-14 15:26:56,637 server.py:1862] Dispatching request to 
<Instance 0: 0/8, total: 0 [handling ready request]> after 0.0000s pending
DEBUG    2013-03-14 15:26:57,414 api_server.py:191] Handled logservice.Flush in 
0.0013
DEBUG    2013-03-14 15:26:57,421 instance.py:385] Request handled by <Instance 
0: 1/8, total: 1 [handling ready request]> in 0.7829s
DEBUG    2013-03-14 15:26:57,422 server.py:1932] Dispatching request to 
<Instance 0: 0/8, total: 1> after 1.6488s pending
INFO     2013-03-14 15:26:57,427 server.py:559] be: "GET /_ah/start HTTP/1.1" 
404 -
DEBUG    2013-03-14 15:26:57,427 server.py:1981] Sent start request: <Instance 
0: 1/8, total: 2>
DEBUG    2013-03-14 15:26:58,071 inotify_file_watcher.py:176] wd=1, mask=0x200, 
cookie=0, length=16, name='main.pyc'
DEBUG    2013-03-14 15:26:58,072 inotify_file_watcher.py:176] wd=1, mask=0x100, 
cookie=0, length=16, name='main.pyc'
DEBUG    2013-03-14 15:26:58,072 inotify_file_watcher.py:176] wd=1, mask=0x2, 
cookie=0, length=16, name='main.pyc'
DEBUG    2013-03-14 15:26:58,087 server.py:1862] Dispatching request to 
<Instance 0: 1/8, total: 2> after 0.0000s pending
DEBUG    2013-03-14 15:26:58,107 api_server.py:191] Handled logservice.Flush in 
0.0005
DEBUG    2013-03-14 15:26:58,112 instance.py:385] Request handled by <Instance 
0: 1/8, total: 3> in 0.0229s
INFO     2013-03-14 15:26:58,116 server.py:559] be: "GET /_ah/stop HTTP/1.1" 
200 -
DEBUG    2013-03-14 15:26:58,116 server.py:623] Sent shutdown request: 
<Instance 0: 1/8, total: 3 [quitting]>
DEBUG    2013-03-14 15:26:58,975 instance.py:278] Started instance: <Instance 
0: 0/8, total: 0 [handling ready request]>
DEBUG    2013-03-14 15:26:58,975 server.py:1972] Started instance: <Instance 0: 
0/8, total: 0 [handling ready request]> at http://localhost:52972
DEBUG    2013-03-14 15:26:58,977 server.py:1862] Dispatching request to 
<Instance 0: 0/8, total: 0 [handling ready request]> after 0.0000s pending
DEBUG    2013-03-14 15:26:59,779 api_server.py:191] Handled logservice.Flush in 
0.0108
DEBUG    2013-03-14 15:26:59,785 instance.py:385] Request handled by <Instance 
0: 1/8, total: 1 [handling ready request]> in 0.8072s
INFO     2013-03-14 15:26:59,787 server.py:559] be: "GET /_ah/start HTTP/1.1" 
404 -
DEBUG    2013-03-14 15:26:59,788 server.py:1981] Sent start request: <Instance 
0: 0/8, total: 1>
DEBUG    2013-03-14 15:27:28,079 instance.py:315] Quit instance: <Instance 0: 
1/8, total: 3 [quitting quit]>
DEBUG    2013-03-14 15:27:28,088 instance.py:385] Request handled by <Instance 
0: 1/8, total: 3 [quitting quit]> in 30.6659s
BadStatusLine("''",)
Traceback (most recent call last):
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 1302, in communicate
    req.respond()
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 831, in respond
    self.server.gateway(self).respond()
  File "/home/user/appengine/d2/lib/cherrypy/cherrypy/wsgiserver/wsgiserver2.py", line 2115, in respond
    response = self.req.server.wsgi_app(self.env, self.start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/wsgi_server.py", line 245, in __call__
    return app(environ, start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 2091, in __call__
    return self._handle_request(environ, start_response, inst)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 601, in _handle_request
    environ, wrapped_start_response)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/request_rewriter.py", line 311, in _rewriter_middleware
    response_body = iter(application(environ, wrapped_start_response))
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/server.py", line 1934, in _handle_script_request
    request_id, request_type)
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/instance.py", line 382, in handle
    request_type))
  File "/home/user/appengine/d2/google/appengine/tools/devappserver2/http_runtime.py", line 147, in handle
    response = connection.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1034, in getresponse
    response.begin()
  File "/usr/lib/python2.7/httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.7/httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''

Original comment by pdknsk on 14 Mar 2013 at 3:35

GoogleCodeExporter commented 9 years ago 
I don't know if this issue has been worked on, but in 1.7.7 it still occurs.

Original comment by pdknsk on 3 Apr 2013 at 3:19

GoogleCodeExporter commented 9 years ago 
Why can't I +1 this instead of starring it?

This issue happens all the time for me as well

Original comment by s...@blinkfire.com on 18 May 2013 at 11:21

GoogleCodeExporter commented 9 years ago 
I see this on a more or less daily basis

Original comment by o...@humblebundle.com on 28 May 2013 at 6:42

GoogleCodeExporter commented 9 years ago 
I have code that can reproduce this issue almost exactly 50% of the time. The 
code involves backend instances (called from a frontend instance via urlfetch) 
doing a lot of writing to the datastore, if that matters.

Recently this issue has been significantly impeding my workflow.

Original comment by a...@humblebundle.com on 28 May 2013 at 6:46

GoogleCodeExporter commented 9 years ago 
This issue tracker appears abandoned. I've filed a new issue. I also just 
noticed that my comment from March 14 with the full debug log is deleted. I 
cannot undelete it. Maybe it is automatically deleted because of length.

https://code.google.com/p/googleappengine/issues/detail?id=9399

Original comment by pdknsk on 28 May 2013 at 7:20