httptunnel

URLs look like this:

POST /index.html?crap=102944784
POST /index.html?crap=102944785
POST /index.html?crap=102944786

Data is sent as HTTP POST data.
Data is received as HTTP document response.
Server cannot connect to client
Client connects periodically with NOP.
Can create full VPN using ppp on both ends.
Can use SSH RemoteForwards to tunnel back in.