[Req] Full URL request like using remote proxy

[bugmenot]

maybe this is the most stupid question...
but i need your help friends, how can I make the full url in GET header request while i'm editing the HOST too..?

for example
while using proxy:

Code:

Using Proxy - 10.20.27.250:8080
GET http://wap.smartwap.net/favicon.ico HTTP/1.1
Host: wap.smartwap.net

without proxy

Code:

GET /favicon.ico HTTP/1.1
Host: wap.smartwap.net

so what i want is to request full url even though im not using proxy.
like

Code:

GET http://wap.smartwap.net/favicon.ico HTTP/1.1
Host: wap.smartwap.net

i've tried edit the "URL:" header but i always failed, please help me..