_ ga and _ gat are not actually returned by the server, but are created through js, and
is created through the following code in the framework.js file

S = function(e, t, r, o, i, a) {
            if (!(i = !T(i) && !(C.test(k.location.hostname) || "/" == r && L.test(o))))
                return !1;
            if (t && 1200 < t.length && (t = t.substring(0, 1200),
            n(24)),
            r = e + "=" + t + "; path=" + r + "; ",
            a && (r += "expires=" + new Date((new Date).getTime() + a).toGMTString() + "; "),
            o && "none" != o && (r += "domain=" + o + ";"),
            o = k.cookie,
            k.cookie = r,
            !(o = o != k.cookie))
                e: {
                    for (e = j(e),
                    o = 0; o < e.length; oPP)
                        if (t == e[o]) {
                            o = !0;
                            break e
                        }
                    o = !1
                }
            return o
        }

break point can be seen