back inject http injector

BACK means behind the first connection (ssh / vpn / direct dependent) then followed by the BUG.

Example 1:
[realData] GET http://bug.com/
HTTP/1.1 [crlf]Host: bug.com [crlf][crlf]

Example 2:
CONNECT ipssh: portssh HTTP/1.0[crlf][crlf]GET http://bug.com/ HTTP/1.1 [crlf] Host: bug.com [crlf][crlf]

Blue = connection
Method = GET
Red = Bug
Protocol version = HTTP/1.1