The http server sent an invalid Content-Length header

["Rafael A . Schmitt" <rafaelsch@terra.com.br>]

what is this? i've been receiving this message from the last two weeks.
# apt-get update
 Err http://http.us.debian.org stable/main Packages                             
 The http server sent an invalid Content-Length header
 Err http://http.us.debian.org stable/main Release                                         
  The http server sent an invalid Content-Length header
  Err http://security.debian.org stable/updates/main Packages                               
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/main Packages                                  
  The http server sent an invalid Content-Length heade
  Err http://security.debian.org stable/updates/main Release                                
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/main Release                               
  The http server sent an invalid Content-Length header
  Err http://security.debian.org stable/updates/contrib Packages                            
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/contrib Packages                               
  The http server sent an invalid Content-Length header
  Err http://security.debian.org stable/updates/contrib Release                             
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/contrib Release                                
  The http server sent an invalid Content-Length header
  Err http://security.debian.org stable/updates/non-free Packages                           
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/non-free Packages                              
  The http server sent an invalid Content-Length header
  Err http://security.debian.org stable/updates/non-free Release                            
  The http server sent an invalid Content-Length header
  Err http://non-us.debian.org stable/non-US/non-free Release
  The http server sent an invalid Content-Length header
  Err http://http.us.debian.org stable/contrib Packages
  The http server sent an invalid Content-Length header
  Err http://http.us.debian.org stable/contrib Release
  The http server sent an invalid Content-Length header
  Err http://http.us.debian.org stable/non-free Packages
  The http server sent an invalid Content-Length header
  Err http://http.us.debian.org stable/non-free Release
  The http server sent an invalid Content-Length header