Django IOError 无法写入数据 - 处理 WSGI 脚本时发生异常

Question

[Mon Dec 12 10:45:23 2016] [error] [client 178.161.91.227] (70007)The timeout specified has expired: mod_wsgi (pid=941): Unable to get bucket brigade for request.
[Mon Dec 12 10:45:23 2016] [error] Internal Server Error: /profile/
[Mon Dec 12 10:45:23 2016] [error] Traceback (most recent call last):
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/core/handlers/base.py", line 149, in get_response
[Mon Dec 12 10:45:23 2016] [error]     response = self.process_exception_by_middleware(e, request)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/core/handlers/base.py", line 147, in get_response
[Mon Dec 12 10:45:23 2016] [error]     response = wrapped_callback(request, *callback_args, **callback_kwargs)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
[Mon Dec 12 10:45:23 2016] [error]     return view_func(*args, **kwargs)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
[Mon Dec 12 10:45:23 2016] [error]     return self.dispatch(request, *args, **kwargs)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch
[Mon Dec 12 10:45:23 2016] [error]     response = self.handle_exception(exc)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch
[Mon Dec 12 10:45:23 2016] [error]     response = handler(request, *args, **kwargs)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/projects/capstone/app/views.py", line 258, in get
[Mon Dec 12 10:45:23 2016] [error]     pk = request.data.get('pk', None)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/request.py", line 353, in __getattribute__
[Mon Dec 12 10:45:23 2016] [error]     return super(Request, self).__getattribute__(attr)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/request.py", line 183, in data
[Mon Dec 12 10:45:23 2016] [error]     self._load_data_and_files()
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/request.py", line 243, in _load_data_and_files
[Mon Dec 12 10:45:23 2016] [error]     self._data, self._files = self._parse()
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/request.py", line 289, in _parse
[Mon Dec 12 10:45:23 2016] [error]     parsed = parser.parse(stream, media_type, self.parser_context)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/rest_framework/parsers.py", line 66, in parse
[Mon Dec 12 10:45:23 2016] [error]     data = stream.read().decode(encoding)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/http/request.py", line 322, in read
[Mon Dec 12 10:45:23 2016] [error]     six.reraise(UnreadablePostError, UnreadablePostError(*e.args), sys.exc_info()[2])
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/http/request.py", line 320, in read
[Mon Dec 12 10:45:23 2016] [error]     return self._stream.read(*args, **kwargs)
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 47, in read
[Mon Dec 12 10:45:23 2016] [error]     result = self.buffer + self._read_limited()
[Mon Dec 12 10:45:23 2016] [error]   File "/sites/virtualenvs/capstone/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 41, in _read_limited
[Mon Dec 12 10:45:23 2016] [error]     result = self.stream.read(size)
[Mon Dec 12 10:45:23 2016] [error] UnreadablePostError: request data read error
[Mon Dec 12 10:45:23 2016] [error] [client 178.161.91.227] mod_wsgi (pid=937): Exception occurred processing WSGI script '/sites/projects/capstone/project/wsgi.py'.
[Mon Dec 12 10:45:23 2016] [error] [client 178.161.91.227] IOError: failed to write data
[Mon Dec 12 14:18:18 2016] [error] Not Found: /
[Mon Dec 12 20:15:04 2016] [error] Not Found: /etc/lib/pChart2/examples/index.php
[Tue Dec 13 07:01:55 2016] [error] Not Found: /
[Tue Dec 13 07:01:55 2016] [error] Not Found: /
[Tue Dec 13 07:14:10 2016] [error] Not Found: /
[Tue Dec 13 07:14:11 2016] [error] Not Found: /
[Tue Dec 13 07:39:17 2016] [error] Not Found: /

这是我在服务器中的 error_log 的最新部分。这个错误随机弹出（我看不到模式）。我研究了很多，但找不到解决方案，尝试了无数在谷歌上发现的东西，但没有任何效果。有点工作然后停止工作的一件事是更改apache配置文件中“Timeout”的值并增加它，现在是600。它当时解决了问题，然后问题又回来了。我第一次遇到它时，我更改了 Django 代码中的 URI 端点和视图函数的名称，但保留了相同的旧代码，问题就消失了。但后来又回来了。

我正在使用 Django==1.9.6 和 MySQL-python==1.2.5 和 Apache/2.2.22（Ubuntu 12.04 LTS x86_64 Minimal）

以下是访问日志中导致此错误弹出的条目。

178.161.91.227 - - [12/Dec/2016:10:45:13 +0000] "GET /profile/ HTTP/1.1" 500 637 "-" "Capstone-Project/1.0 (alebrahim.Capstone-Project; build:1; iOS 10.1.0) Alamofire/4.1.0"

我不知道还有什么相关的，如果需要任何信息，我会在这里添加。

edit：我们注意到这个问题只有在 Alamofire 请求将请求对象编码为 JSON 时才会出现。如果没有编码，这个问题就会消失。

Answer 1

这两个错误都是由 HTTP 客户端在请求完成之前断开连接引起的。这可能会导致请求正文被截断，从而导致读取错误，或者在连接已关闭的情况下出现写入错误。发生这种情况是很正常的，您的应用程序中没有什么可以阻止它，因为它是由另一端用户的故意操作引起的，或者可能是介于两者之间的网络问题。