Thanks for your response. Sorry I didn't respond earlier--been quite busy.
I don't know for certain that anyone's seeing a 500 response--I get an e-mail from Django (traceback below) and an error in the Apache logs (below). I've never received an actual error report from a user (and most of my users aren't the most technically inclined...) so I don't know what they see. I've never been able to duplicate this myself; it happens on average once or twice a week, although it seems to occasionally happen to the same person a couple of times within the span of a few minutes. Also, mod_wsgi is configured in daemon mode, with 1 process and 1 thread, if that matters. I haven't had a chance to try the debugging recipe you provided yet; it's a production site, so I'm rather loathe to mess with it, if I can avoid it. Not to say that I won't try that, if it comes to it. Thanks. Apache log and traceback (both anonymized): [Sat May 16 21:54:10 2009] [error] [client 75.33.xx.xx] (70014)End of file found: mod_wsgi (pid=25650): Unable to get bucket brigade for request., referer: https://domain.com/account/store/178/manage/item/create/ [Sat May 16 17:54:10 2009] [error] [client 75.33.xx.xx] mod_wsgi (pid=18243): Exception occurred processing WSGI script '/var/www/ domain.com/django.wsgi'. [Sat May 16 17:54:10 2009] [error] [client 75.33.xx.xxx] IOError: client connection closed (ignore the time difference--the server is on GMT, but Django is on EST) Traceback (most recent call last): File "/var/lib/python-support/python2.5/django/core/handlers/ base.py", line 86, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/var/www/domain.com/domain/djangologging/decorators.py", line 10, in decorated response = func(*args, **kwargs) File "/var/www/domain.com/domain/store/views.py", line 137, in random_items_ajax if not request.POST or 'count' not in request.POST: File "/var/lib/python-support/python2.5/django/core/handlers/ wsgi.py", line 169, in _get_post self._load_post_and_files() File "/var/lib/python-support/python2.5/django/core/handlers/ wsgi.py", line 149, in _load_post_and_files self._post, self._files = http.QueryDict(self.raw_post_data, encoding=self._encoding), datastructures.MultiValueDict() File "/var/lib/python-support/python2.5/django/core/handlers/ wsgi.py", line 203, in _get_raw_post_data size=content_length) File "/var/lib/python-support/python2.5/django/core/handlers/ wsgi.py", line 69, in safe_copyfileobj buf = fsrc.read(min(length, size)) IOError: request data read error <WSGIRequest GET:<QueryDict: {}>, POST:<QueryDict: {}>, COOKIES:{'sessionid': 'xxx'}, META:{'CONTENT_LENGTH': '7', 'CONTENT_TYPE': 'application/x-www-form-urlencoded; charset=UTF-8', 'DOCUMENT_ROOT': '/var/www/domain.com/domain/www', 'GATEWAY_INTERFACE': 'CGI/1.1', 'HTTP_ACCEPT': '*/*', 'HTTP_ACCEPT_ENCODING': 'gzip, deflate', 'HTTP_ACCEPT_LANGUAGE': 'en-us', 'HTTP_CACHE_CONTROL': 'no-cache', 'HTTP_CONNECTION': 'Keep-Alive', 'HTTP_COOKIE': 'sessionid=xxx', 'HTTP_HOST': 'domain.com', 'HTTP_REFERER': 'http://domain.com/page/how_to_sell/', 'HTTP_USER_AGENT': 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; yie8)', 'HTTP_X_REQUESTED_WITH': 'XMLHttpRequest', 'PATH': '/usr/local/bin:/usr/bin:/bin', 'PATH_INFO': u'/ajax/random_items/', 'PATH_TRANSLATED': '/var/www/domain.com/django.wsgi/ajax/ random_items/', 'QUERY_STRING': '', 'REMOTE_ADDR': 'xx.xx.xx.xx', 'REMOTE_PORT': '50355', 'REQUEST_METHOD': 'POST', 'REQUEST_URI': '/ajax/random_items/', 'SCRIPT_FILENAME': '/var/www/domain.com/django.wsgi', 'SCRIPT_NAME': u'', 'SCRIPT_URI': 'http://domain.com/ajax/random_items/', 'SCRIPT_URL': '/ajax/random_items/', 'SERVER_ADDR': 'xx.xx.xx.xx', 'SERVER_ADMIN': '[no address given]', 'SERVER_NAME': 'domain.com', 'SERVER_PORT': '80', 'SERVER_PROTOCOL': 'HTTP/1.1', 'SERVER_SIGNATURE': '<address>Apache/2.2.9 (Ubuntu) mod_ssl/2.2.9 OpenSSL/0.9.8g mod_wsgi/2.3 Python/2.5.2 Server at domain.com Port 80</ address>\n', 'SERVER_SOFTWARE': 'Apache/2.2.9 (Ubuntu) mod_ssl/2.2.9 OpenSSL/ 0.9.8g mod_wsgi/2.3 Python/2.5.2', 'mod_wsgi.application_group': 'domain.com|', 'mod_wsgi.callable_object': 'application', 'mod_wsgi.listener_host': '', 'mod_wsgi.listener_port': '80', 'mod_wsgi.process_group': 'domain.com', 'mod_wsgi.reload_mechanism': '1', 'mod_wsgi.script_reloading': '1', 'wsgi.errors': <mod_wsgi.Log object at 0x55555878e8d0>, 'wsgi.file_wrapper': <built-in method file_wrapper of mod_wsgi.Adapter object at 0x5555591e1b70>, 'wsgi.input': <mod_wsgi.Input object at 0x55555900ef70>, 'wsgi.multiprocess': True, 'wsgi.multithread': False, 'wsgi.run_once': False, 'wsgi.url_scheme': 'http', 'wsgi.version': (1, 0)}> Thanks a lot, Jeff On May 21, 10:47 pm, Graham Dumpleton <graham.dumple...@gmail.com> wrote: > On May 22, 12:31 pm, Jeff FW <jeff...@gmail.com> wrote: > > > > > I've had the same problem, and can't figure out how to resolve it. It > > seems to have nothing to do with the amount of data being transfered: > > it happens occasionally on the smallest of page requests/responses. > > It also doesn't seem to be related to browser, unless several > > different versions of IE *and* Safari have the same problem. I tried > > disabling keepalives for Safari at least, and it doesn't seem to have > > helped. I'd prefer not to disable keepalives in general, if I can > > avoid it. > > > All of the error messages I've received have shown in the traceback > > that they're coming through this > > function:http://code.djangoproject.com/browser/django/trunk/django/core/handle... > > > It seems to me like there's an easy workaround (I'm sure the actual > > fix has to be much lower level, in WSGI or Apache [or even lower]) > > that would at least stop my users from getting 500 errors: wrap the > > contents of that function in a try block, and *don't* raise the > > exception. > > > Otherwise, I'd have to wrap every view that uses POST in that, which > > would be very annoying. Or maybe write middleware that just peeks at > > POST before anything else gets it, so that I could catch it there. > > > Thoughts? > > If clients are actually see a 500 error response, at least means that > return part of socket connection hasn't been closed. Is that want you > really meant, or is the 500 error in the logs and clients get a blank > page. > > If you could duplicate it, which it seems you can't, I would have > suggested using second recipe in: > > http://code.google.com/p/modwsgi/wiki/DebuggingTechniques#Tracking_Re... > > to try and capture request content and response to see how much of the > request is actually being received. > > BTW, are you using mod_wsgi embedded mode or daemon mode? > > Also post an actual example traceback and what errors you get in the > Apache error log just to validate the nature of the problem. > > Graham > > > Thanks, > > Jeff > > > On Mar 31, 6:40 pm, Graham Dumpleton <graham.dumple...@gmail.com> > > wrote: > > > > On Apr 1, 1:34 am, akaihola <akaih...@gmail.com> wrote: > > > > > We ran into the same issue Chunlei Wu described in January[1]. A user > > > > was trying to upload large files and all we got were 500 errors by e- > > > > mail: > > > > > File "/home/citedesarts/src/django/django/http/multipartparser.py", > > > > line 406, inread > > > >IOError:requestdatareaderror > > > > > The user was on a public library computer with IE7. We're running > > > > Apache 2.2.9 andmod_wsgi2.3 as packaged in Debian 5.0 Lenny. > > > > > I'm wondering about the HTTP_VIA header, could that have contributed > > > > to the problem? > > > > The presence of the header itself is not likely to cause the issue, > > > but its presence does indicate that therequestwent via a proxy or > > > other sort of software. That proxy may have been killing off requests > > > which took too long. > > > > The basic problem remains that the connection to the HTTP server was > > > dropped before alldatacould beread. > > > > Graham > > > > > [1]http://groups.google.fi/group/django-users/browse_thread/thread/ > > > > 946936f69c012d96 > > > > > ---- > > > > > Below is the WSGIRequest dump from the 500 e-mail: > > > > > <WSGIRequest > > > > GET:<QueryDict: {}>, > > > > POST:<could not parse>, > > > > COOKIES:{'sessionid': '83bc617fed936487b17f7d14848d245c'}, > > > > META:{'CONTENT_LENGTH': '30977474', > > > > 'CONTENT_TYPE': 'multipart/form-data; > > > > boundary=---------------------------7d9c0903da', > > > > 'DOCUMENT_ROOT': '/home/mysite/media', > > > > 'GATEWAY_INTERFACE': 'CGI/1.1', > > > > 'HTTP_ACCEPT': 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, > > > > application/x-shockwave-flash, application/vnd.ms-excel, application/ > > > > vnd.ms-powerpoint, application/msword, */*', > > > > 'HTTP_ACCEPT_LANGUAGE': 'fi', > > > > 'HTTP_CACHE_CONTROL': 'no-cache', > > > > 'HTTP_CONNECTION': 'Keep-Alive', > > > > 'HTTP_COOKIE': 'sessionid=83bc617fed936487b17f7d14848d245c', > > > > 'HTTP_HOST': 'mysite.com', > > > > 'HTTP_REFERER': 'http://mysite.com/myform/', > > > > 'HTTP_UA_CPU': 'x86', > > > > 'HTTP_USER_AGENT': 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT > > > > 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)', > > > > 'HTTP_VIA': '1.1 EDUISAIMA', > > > > 'PATH': '/usr/local/bin:/usr/bin:/bin', > > > > 'PATH_INFO': u'/myform/', > > > > 'PATH_TRANSLATED': '/home/mysite/deploy/mysite/myform/', > > > > 'QUERY_STRING': '', > > > > 'REMOTE_ADDR': '194.xxx.xxx.xxx', > > > > 'REMOTE_PORT': '26205', > > > > 'REQUEST_METHOD': 'POST', > > > > 'REQUEST_URI': '/myform/', > > > > 'SCRIPT_FILENAME': '/home/mysite/deploy/mysite.wsgi', > > > > 'SCRIPT_NAME': u'', > > > > 'SERVER_ADDR': '78.xxx.xxx.xxx', > > > > 'SERVER_ADMIN': 'ad...@mysine.com', > > > > 'SERVER_NAME': 'mysite.com', > > > > 'SERVER_PORT': '80', > > > > 'SERVER_PROTOCOL': 'HTTP/1.1', > > > > 'SERVER_SIGNATURE': '<address>Apache/2.2.9 (Debian)mod_wsgi/2.3 > > > > Python/2.5.2 Server at mysite.com Port 80</address>\n', > > > > 'SERVER_SOFTWARE': 'Apache/2.2.9 (Debian)mod_wsgi/2.3 Python/2.5.2', > > > > 'mod_wsgi.application_group': 'mysite.com|', > > > > 'mod_wsgi.callable_object': 'application', > > > > 'mod_wsgi.listener_host': '', > > > > 'mod_wsgi.listener_port': '80', > > > > 'mod_wsgi.process_group': 'mysite', > > > > 'mod_wsgi.reload_mechanism': '1', > > > > 'mod_wsgi.script_reloading': '1', > > > > 'wsgi.errors': <mod_wsgi.Log object at 0x2c3df90>, > > > > 'wsgi.file_wrapper': <built-in method file_wrapper ofmod_wsgi.Adapter > > > > object at 0x24aeeb8>, > > > > 'wsgi.input': <mod_wsgi.Input object at 0x2fb98f0>, > > > > 'wsgi.multiprocess': True, > > > > 'wsgi.multithread': True, > > > > 'wsgi.run_once': False, > > > > 'wsgi.url_scheme': 'http', > > > > 'wsgi.version': (1, 0)}> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. 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