HTTP persistent connection

[Lucas]

I'm trying understand the function InternetSetOption

How can I create a Http member function to set:

INTERNET_OPTION_MAX_CONNS_PER_SERVER
INTERNET_OPTION_MAX_CONNS_PER_1_0_SERVER
INTERNET_OPTION_CONNECT_TIMEOUT
INTERNET_OPTION_RECEIVE_TIMEOUT
INTERNET_OPTION_FROM_CACHE_TIMEOUT

another question:

if set INTERNET_OPTION_RECEIVE_TIMEOUT is necessary to use Http.PostWithTimeout?