El opera permite identificarse de diferentes maneras
Para ver la que utiliza nuestro navegador basta con hacer un simple programa que escuche en el puerto 80.
Esto es lo que envia el FireFox 1.0.4 que tengo:
GET / HTTP/1.1
Host: 127.0.0.01
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; es-AR; rv:1.7.8) Gecko/2005
0511 Firefox/1.0.4
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: es-ar,es;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Internet Explorer 6.0.2800.1106 (cuantas subversiones!):
GET / HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shock
wave-flash, application/vnd.ms-powerpoint, application/msword, application/vnd.m
s-excel, */*
Accept-Language: es
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; FunWebProducts; .
NET CLR 1.1.4322)
Host: 127.0.0.01
Connection: Keep-Alive