我似乎正在收到IOError：当我执行Ajax上传时，请求数据读取错误很多。例如，每5个文件上传一次，就会至少出现3次错误。
其他人似乎也有同样的问题。例如。
Django文件上传偶尔会失败 其他一些观察：
绝对不是我的互联网连接或浏览器问题。似乎在所有浏览器chrome / FF / opera上都在发生。
我正在lucid上运行Django 1.1.1 Apache / 2.2.14（Ubuntu）mod_ssl / 2.2.14 OpenSSL / 0.9.8k mod_wsgi / 2.8 Python / 2.6.5 。
它也不是文件大小。有时我可以上传1个以上的MB文件，但无法上传180 Kb的文件。
追溯
Traceback (most recent call last): File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/core/handlers/base.py", line 98, in get_response response = middleware_method(request, e) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/core/handlers/base.py", line 92, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/contrib/auth/decorators.py", line 78, in __call__ return self.view_func(request, *args, **kwargs) File "/home/ubuntu/webapps/anonymous_app/app/do_work/views/__init__.py", line 391, in some_form_ajax_upload f = request.FILES.get('file_upload') File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 187, in _get_files self._load_post_and_files() File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 137, in _load_post_and_files self._post, self._files = self.parse_file_upload(self.META, self.environ['wsgi.input']) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/__init__.py", line 124, in parse_file_upload return parser.parse() File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 133, in parse for item_type, meta_data, field_stream in Parser(stream, self._boundary): File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 606, in __iter__ for sub_stream in boundarystream: File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 420, in next return LazyStream(BoundaryIter(self._stream, self._boundary)) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 446, in __init__ unused_char = self._stream.read(1) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 299, in read out = ''.join(parts()) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 292, in parts chunk = self.next() File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 314, in next output = self._producer.next() File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 375, in next data = self.flo.read(self.chunk_size) File "/home/ubuntu/.virtualenvs/anonymous_app/lib/python2.6/site-packages/django/http/multipartparser.py", line 405, in read return self._file.read(num_bytes) IOError: request data read error <WSGIRequest GET:<QueryDict: {}>, POST:<could not parse>, COOKIES:{'__utma': '168279989.1688771210.1285773436.1285773436.1285773436.1', '__utmb': '168279989.20.10.1285773436', '__utmc': '168279989', '__utmz': '168279989.1285773436.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)', 'beta': 'True', 'sessionid': 'b1ecf92f2bba13e1885d07803e10aa03', 'timezone_offset': '-330'}, META:{'CONTENT_LENGTH': '188575', 'CONTENT_TYPE': 'multipart/form-data; boundary=---------------------------57602381214905740261171925981', 'DOCUMENT_ROOT': '/htdocs', 'GATEWAY_INTERFACE': 'CGI/1.1', 'HTTPS': '1', 'HTTP_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'HTTP_ACCEPT_CHARSET': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7', 'HTTP_ACCEPT_ENCODING': 'gzip,deflate', 'HTTP_ACCEPT_LANGUAGE': 'en-us,en;q=0.5', 'HTTP_CONNECTION': 'keep-alive', 'HTTP_COOKIE': 'beta=True; __utma=168279989.1688771210.1285773436.1285773436.1285773436.1; __utmb=168279989.20.10.1285773436; __utmc=168279989; __utmz=168279989.1285773436.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); sessionid=b1ecf92f2bba13e1885d07803e10aa03; timezone_offset=-330', 'HTTP_HOST': 'xxxxxx.compute-1.amazonaws.com', 'HTTP_KEEP_ALIVE': '115', 'HTTP_REFERER': 'https://ec2-184-72-79-96.compute-1.amazonaws.com/do-my-somees/enter/some-documents/', 'HTTP_USER_AGENT': 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.10) Gecko/20100915 Ubuntu/10.04 (lucid) Firefox/3.6.10', 'PATH': '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin', 'PATH_INFO': u'/do-my-somees/enter/some-documents/ajax-upload/Other-some-Document/', 'PATH_TRANSLATED': '/home/ubuntu/webapps/anonymous_app/settings/apache/qa.wsgi.py/do-my-somees/enter/some-documents/ajax-upload/Other-some-Document/', 'QUERY_STRING': '', 'REMOTE_ADDR': '', 'REMOTE_PORT': '15561', 'REQUEST_METHOD': 'POST', 'REQUEST_URI': '/do-my-somees/enter/some-documents/ajax-upload/Other-some-Document/', 'SCRIPT_FILENAME': '/home/ubuntu/webapps/anonymous_app/settings/apache/qa.wsgi.py', 'SCRIPT_NAME': u'', 'SERVER_ADDR': '10.196.142.182', 'SERVER_ADMIN': 'dev@anonymous_app.com', 'SERVER_NAME': 'ec2-184-72-79-96.compute-1.amazonaws.com', 'SERVER_PORT': '443', 'SERVER_PROTOCOL': 'HTTP/1.1', 'SERVER_SIGNATURE': '<address>Apache/2.2.14 (Ubuntu) Server at ec2-184-72-79-96.compute-1.amazonaws.com Port 443</address>\n', 'SERVER_SOFTWARE': 'Apache/2.2.14 (Ubuntu)', 'SSL_TLS_SNI': 'ec2-184-72-79-96.compute-1.amazonaws.com', 'mod_wsgi.application_group': 'qa.anonymous_app.com|', 'mod_wsgi.callable_object': 'application', 'mod_wsgi.listener_host': '', 'mod_wsgi.listener_port': '443', 'mod_wsgi.process_group': '', 'mod_wsgi.reload_mechanism': '0', 'mod_wsgi.script_reloading': '1', 'mod_wsgi.version': (2, 8), 'wsgi.errors': <mod_wsgi.Log object at 0xb9456860>, 'wsgi.file_wrapper': <built-in method file_wrapper of mod_wsgi.Adapter object at 0xb936a968>, 'wsgi.input': <mod_wsgi.Input object at 0xb9720e30>, 'wsgi.multiprocess': True, 'wsgi.multithread': False, 'wsgi.run_once': False, 'wsgi.url_scheme': 'https', 'wsgi.version': (1, 0)}>
我也有这个例外。在Apache错误日志文件中，我看到以下内容：
[Wed Aug 17 08:30:45 2011] [error] [client 10.114.48.206] (70014)End of file found: mod_wsgi (pid=9722): Unable to get bucket brigade for request., referer: https://egs-work/modwork/beleg/188074/edit/ [Wed Aug 17 08:30:45 2011] [error] [client 10.114.48.206] mod_wsgi (pid=3572): Exception occurred processing WSGI script '/home/modwork_egs_p/modwork_egs/apache/django_wsgi.py'. [Wed Aug 17 08:30:45 2011] [error] [client 10.114.48.206] IOError: failed to write data
版本：
apache2-prefork-2.2.15-3.7.x86_64 apache2-mod_wsgi-3.3-1.8.x86_64 WSGIDaemonProcess with threads=1 mod_ssl/2.2.15 Linux egs-work 2.6.34.8-0.2-default #1 SMP 2011-04-06 18:11:26 +0200 x86_64 x86_64 x86_64 GNU/Linux openSUSE 11.3 (x86_64)
首先我很困惑，因为最后一行“无法写入数据”不适合django代码“加载发布数据”。但是我想django想要向客户写一个错误页面。但是客户端已取消tcp连接。现在，http 500页面无法写入客户端。
客户端在发送请求之后并获得响应之前已断开连接：
很容易复制：
插入一些在第一次访问request.POST之前等待的代码（请确保没有中间件在time.sleep（）之前访问request.POST）：
def edit(request): import time time.sleep(3) #.....
现在进行一次大型POST（例如文件上传）。我不知道Apache缓冲区的大小。但是5 MB应该足够了。当浏览器显示沙漏时，浏览到另一个页面。浏览器将取消该请求，并且异常应在日志文件中。
这是我的中间件，因为我不想在我们的日志文件中获得上述回溯：
class HandleExceptionMiddleware: def process_exception(self, request, exception): if isinstance(exception, IOError) and 'request data read error' in unicode(exception): logging.info('%s %s: %s: Request was canceled by the client.' % ( request.build_absolute_uri(), request.user, exception)) return HttpResponseServerError()
