CONNECT proxy2_host:proxy2_port HTTP/1.1
TE: deflate,gzip;q=0.3
Connection: TE, close
Host: proxy2_host:proxy2_port
User-Agent: libwww-perl/5.68
Content-Length: 39

GET http://final_destination.example.com/ HTTP/1.0

HTTP/1.0 200 Connection established