web.py's session is based on utils.ThreadedDict, which provide a copy of
variable for each thread, so it's thread safe. I got nothing wrong when I
use the internal CherryPy server for development. Today, I tried almost a
whole day to deploy an application with fastcgi and lighttpd to the
production server, and I cann't do the user authorization anymore! I test
and read the log, and I found that, there is only one Thread being used for
different visitors! I used a processor to identify threads, and here is the
log I got when I tried to visit the app from different computers.

2009-01-05 18:59:23,357 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>
2009-01-05 18:59:23,357 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>
2009-01-05 19:00:30,545 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>
2009-01-05 19:00:30,545 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>
2009-01-05 19:00:32,791 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>
2009-01-05 19:00:32,791 DEBUG [root] current thread is
<_DummyThread(Dummy-6, started daemon)>

as the log shows, only Dummy-6 thread used in that moment.
It's rather strange! is there any one can figure out what wrong with it? and
what should I do to use session in a fastcgi environment?

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