B"H make sure to close sockets when finished
Merge branch 'socket_hang'
B"H net_io.c: revert previous change and advertise HTTP 1.1

It seems server code should be compatible with HTTP 1.1; the features
unique to 1.1 mostly are upon the client to support, and some headers
used (for example Cache-Control) may need 1.1.
Merge branch 'socket_hang'