Run ifconfig on Linux or ipconfig on Windows to find the ip address of the server.
$ sudo ifconfig
wlan0 Link encap:Ethernet HWaddr 30:3a:64:b3:be:6a
inet addr:192.168.1.103 Bcast:192.168.1.255 Mask:255.255.255.0
Here in case the url would be:
http://192.168.1.103:8000/test.html