id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
11015	django-1.0.2 does not catch the exception that database backend first close the db connection.	qingran	nobody	"I am running django-1.0.2 by fastcgi with nginx-0.6.36. Now I found out this error
{{{
message: Unhandled Exception
An unhandled exception was thrown by the application. 
}}}

And in nginx's error log I found:

{{{
--------------------------------------------
2009/05/06 01:03:21 [error] 14785#0: *290 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 2.3.1.5, server: ui.zeuux.com, request: ""POST /blog/user/qingran/post/ HTTP/1.1"", upstream: ""fastcgi://unix:/var/run/fcgi.sock:"", host: ""mydomain"", referrer: ""http://ui.zeuux.com/blog/user/qingran/post/""sic/css/zeuux-com-component-editor.css HTTP/1.1"", host: ""mydomain"", referrer: ""http://mydomain/post/""

2009/05/06 01:05:14 [error] 14785#0: *368 FastCGI sent in stderr: ""Traceback (most recent call last):
  File ""/usr/local/lib/python2.5/site-packages/flup-1.0.1-py2.5.egg/flup/server/fcgi_base.py"", line 558, in run
    protocolStatus, appStatus = self.server.handler(self)
  File ""/usr/local/lib/python2.5/site-packages/flup-1.0.1-py2.5.egg/flup/server/fcgi_base.py"", line 1116, in handler
    result = self.application(environ, start_response)
  File ""/usr/local/lib/python2.5/site-packages/django/core/handlers/wsgi.py"", line 246, in __call__
    signals.request_finished.send(sender=self.__class__)
  File ""/usr/local/lib/python2.5/site-packages/django/dispatch/dispatcher.py"", line 148, in send
    response = receiver(signal=self, sender=sender, **named)
  File ""/usr/local/lib/python2.5/site-packages/django/db/__init__.py"", line 46, in close_connection
    connection.close()
  File ""/usr/local/lib/python2.5/site-packages/django/db/backends/__init__.py"", line 51, in close
    self.connection.close()
InterfaceError: connection already closed"" while reading response header from upstream, client: 2.5.1.4, server: mydomain, request: ""POST /post/ HTTP/1.1"", upstream: ""fastcgi://unix:/var/run/fcgi.sock:"", host: ""mydomain"", referrer: ""http://mydomain/post/""
--------------------------------------------
}}}
At the same time I found out that my database backend firstly closed the connection because of the network program.

I think django should handle this exception by handler500, so I can give the vistor the error page. My enviorment is listed as follows:
 * OS: FreeBSD 6.2 release amd64
 * Python 2.5.2_2
 * Django 1.0.2
 * Database PostgreSQL 8.3.3
 * Webserver Nginx-0.6.36
"		closed	Database layer (models, ORM)	1.0		duplicate			Unreviewed	0	0	0	0	0	0