pcurl and network connection's problem

[sam319]

I am having problems with pycurl in my threads , when i run it , it does correctly but some times the connection has been established but nothing will be downloaded and the threads stay alive without doing any thing (especially when the network's speed is slow and has aborted status) .

i can't use TIMEOUT  because i don't have the max time for downloading 

how can i solve this problem in python