[mod_python] [help]please give an input filter example ?

Hi ,

    I have written an output filter, and it works fine.
But I dont know how to write an input filter, there are not any examples.
I have tried to write an simple input filter according to an output filter.
But it always makes IE hang there.
If any one can give me an example about input filter?
Thanks a lot!

My environment:
  Apache/2.0.44 (Win32) 
  mod_ssl/2.0.44  
  OpenSSL/0.9.7 
  mod_python/3.0.3 
  Python/2.2.2 

Best regards,
camge