Basic HTTP Enable Commands for Cisco Routers

ciscorouter#en
ciscorouter#config t
ciscorouter#ip http server
ciscorouter#ip http authentication local
ciscorouter#ip http secure-server
Ctrl+z
wr

On Another Note if you have not removed SSL V2 and V3
You need to disable it so you can do this by the following commands

ciscorouter#en
ciscorouter#config t
ciscorouter#no ip http server
ciscorouter#no ip http authentication local
ciscorouter#no ip http secure-server
Ctrl+z
wr