Why?
You specify HTTP/1.1 but then do not follow the protocol. Either do:
Code:
GET /wiki/Main_Page HTTP/1.0
or
Code:
GET /wiki/Main_Page HTTP/1.1
Host: en.wikipedia.org
(include those newlines exactly!)
If you want to do raw HTTP over telnet like that, then you'll need to follow the protocol more closely if you want it to work.